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Droughts can have far-reaching environmental, social and economic impacts. A new study has assessed how drought is managed in six areas of Europe using a new evaluation framework. Their evaluation identified policy gaps and makes recommendations for risk management. A key recommendation is to evaluate responses and management after each drought to identify good practices and strengthen drought management in the future.
Weathering of treated wood and other construction materials can lead to the release of chemicals into the environment. Researchers have investigated the release of biocides from wood and roof paints, demonstrating that the amount of water in contact with exposed surfaces is a key factor in determining the level of active chemicals released. The study provides guidance for testing biocidal products in line with the European Biocidal Products Regulation.
Human activities have caused phosphorus to accumulate in soils and water bodies, creating a legacy that could last for decades, new research shows. A study of three major river basins highlights better sewage treatment facilities and reduced fertiliser use as key reasons for an overall decline in phosphorus levels in the Thames River basin, UK, since the late 1990s.
Algal (cyanobacterial) blooms are a major threat to marine and freshwater ecosystems, as well as to human health. This study investigated a way to reduce numbers of harmful cyanobacteria using freshwater crustaceans. Data from a large Swedish lake show that this approach can be effective but is best used alongside other methods, such as nutrient reduction.
As global temperatures continue to warm, sea-levels are expected to rise, increasing the risk of saltwater inundating wetlands in low-lying coastal areas. A study in Wales, UK, describes how rising sea levels will result in a shift from a wetland rich in plant diversity to one dominated by saltwater and mud in 200 years’ time.
Water policies at European and French national levels have led to a clear improvement in the water quality of the River Seine, a new study has found. A significant reduction in phosphate and ammonium pollution and increasing oxygen concentrations are evident. However, nitrate concentrations are still higher than the recommended level for good freshwater status, despite substantial reductions of surplus nitrogen in agricultural soils over the past few decades. The researchers recommend strengthening current agri-environmental management measures to help the river to return to a fully healthy status.
Agricultural run-off can contain pesticides, sediment particles and nitrates and is a major threat to the health of the sea. Although there are policy frameworks to reduce run-off water, they often don’t clearly explain how to maximise benefits. A new study provides an economic framework that prioritises methods based on their cost-effectiveness, which could help policymakers to reduce the pollution of marine ecosystems.
‘Adaptive co-management’ could help water managers cope with future shocks and unpredictability brought by climate change, according to a recent study. They identify five conditions for policies that would create an enabling environment for this management approach, which include the need to account for water’s ecological functions, and for stakeholders to learn from each other.
Assessing threats to biodiversity is necessary for effective spatial planning and balancing sustainable development with conservation. This study details a fine-scale assessment of the effect of a range of threats to coastline habitats within a Marine Protected Area (MPA) in the Mediterranean Sea. The study provides an example of how local-scale assessments can contribute to national conservation policy.
Constructed wetlands are used in many countries as green infrastructure to treat waste water, but may also be biodiversity hotspots, a new study suggests. This study reports on a constructed wetland in an urban area of Italy, which increased the number of plant taxa — including several plants of conservation concern — by over 200%. The researchers say the ability of constructed wetlands to enhance biodiversity could support local development.
Oestrogens are ‘female’ hormones that can enter the aquatic environment after excretion by humans and animals, causing ‘feminisation’ of male fish. This study carried out a risk assessment for oestrogen-like endocrine disruption in the UK in the 2050s, based on likely changes to the human population, river flows and temperature. The authors found that risk is likely to increase under future conditions and recommend further research to assess whether improving sewage treatment could reduce oestrogen pollution.
Fish and shellfish farming are facing a new era of expansion in Europe. What are the environmental implications of this, and how can the sector expand sustainably? Watch the video produced by Science for Environment Policy about how aquaculture could develop in greater harmony with environmental goals.
Wastewater sludge is widely used to remove toxic polycyclic aromatic hydrocarbons (PAHs) from soil, and yet the mechanisms underlying this process remain unclear. A new study reveals the extent of PAH removal following different treatments, and could provide a useful resource for those looking to diminish the effects that these pollutants have both on people and on the environment.
Widespread use of antibiotics has led to pollution of waterways, potentially creating resistance among freshwater bacterial communities. A new study looked for antibiotic resistance genes in a river basin in Spain, revealing that wastewater discharges can promote the spread of antibiotic resistance in streams and small rivers.
Research has found evidence for recent contamination of Lake Como, northern Italy, with chemicals banned in the EU since the 1970s. Levels of DDT and PCBs in sediment, aquatic microorganisms and fish were examined. The results suggest glacial meltwater as a source for renewed DDT contamination and show recent contamination of fish above safe levels. The findings demonstrate the need for continued monitoring of persistent organic pollutants in European waters.
The European anchovy is one of the most important small pelagic fish in the Adriatic Sea, but the size of the stock can fluctuate year on year. This study aimed to investigate the link between anchovy catch and winter circulation patterns in the North Adriatic sea. The findings show that oceanographic conditions during winter determine anchovy abundance. Prediction of these conditions could help to guide sustainable fisheries management in the region.
The impact that national energy sectors have on international freshwater resources has been demonstrated in the first global study of its kind. The analysis of 129 countries showed differences between countries and sectors in their reliance on international freshwater resources. For example, although the petroleum industries of North America and China are similar in magnitude, the North American industry consumes three times as much international freshwater. Demands from economically developed countries on less economically developed countries, which may have pre-existing water-scarcity issues, compound these problems and complicate the creation of policies that ensure both water and energy security.
Soil erosion in Italy could be reduced by 43% if Good Agricultural and Environmental Conditions (GAEC) were fully adopted, a recent study has found. Reducing soil erosion would also increase soil organic carbon stocks, particularly on cultivated sloping land.
Constructed wetlands can remove disease-causing bacteria from wastewater, but their performance is highly dependent on the systems they use, a new study shows. Researchers reviewed results from a wide range of studies on constructed wetlands and found that combining different approaches increased removal of bacteria. However, further research and improvement of wetland systems is required to produce water that is safe for reuse.
The frequency and severity of flooding is expected to increase in the future. This study explored how these changes will affect rivers, in terms of structure as well as animal and plant life. The authors discuss the management implications of their findings and highlight areas for future research, including developing early warning systems for threats to ecosystems.
Researchers have developed a new tool for assessing and predicting the damage caused by droughts to crop yields and hydroelectric energy production. The tool could provide useful information to policymakers, helping them develop drought management practices to improve food and energy security and adapt to climate change.
Researchers have recommended that fish from some sections of the River Po and the River Lambro, one of the Italian River Po tributaries, should not be eaten due to high levels of some endocrine-disrupting chemicals in the river sediments and fish. This recommendation is based on an extensive update regarding pollution levels of such substances in the rivers.
Dense urban environments have significant resource-saving potential and serve as good platforms for climate change mitigation. This study reviewed an initiative to improve use of energy and water in Rotterdam, highlighting factors important for success including exchanges in close geographic proximity and private-sector participation.
To assess the risk posed by metals in the aquatic environment, Biotic Ligand Models (BLMs) were developed, and are now considered suitable for use in regulatory risk assessments. This study reviews the advantages of BLMs and BLM-based software tools, providing examples from across the EU, and offers recommendations for their widespread implementation.
Aquaculture is the fastest growing sector of worldwide food production and is facing a new era of expansion in Europe. What are the environmental implications of this, and can the sector expand sustainably? This Future Brief presents an overview of research into aquaculture’s impacts, and considers how it could develop in balance with environmental goals.
The emissions of two perfluoroalkyl acids (PFAAs) into the Danube River Basin have been estimated in a test of four different hypotheses regarding the factors affecting those emissions. The results were used to simulate water concentrations for comparison with measured data. The researchers found that incorporating wastewater treatment information and wealth distribution alongside population data can improve the accuracy of emissions estimates.
Active pharmaceutical ingredients (APIs) — responsible for the biological activity of drugs — have been widely found in the environment, yet the precise sources and relative importance of emissions via wastewater are not quite clear. This study assessed emissions from three health institutions in Germany — a hospital, a psychiatric hospital, and a nursing home — and found their contribution was low compared to that from households. However, more research is needed to understand the environmental effects of neurological drugs, emissions of which were in some cases relatively high.
A methodology for assessing ‘chemical footprints’ has been developed by researchers to evaluate human pressures and the impact of chemicals released by the production and consumption of goods. The study integrates a life-cycle approach with different methodologies, such as those developed in the context of environmental risk assessment and sustainability science, with the aim of assessing the extent to which chemicals impact on ecosystems beyond their ability to recover (i.e. surpass planetary boundaries).
Environmental risk assessment is challenging because of the complexity of the physical and ecological systems around us. Natural disasters, the spread of dangerous substances, ecosystem changes leading to food and health security issues, and the emergence of new materials, new events and new knowledge make it essential to update our understanding continually, to be able to identify threats and opportunities for timely action. This Thematic Issue presents some collaborative and integrated paths towards forward-thinking assessment and management of environmental risks.
Increasing population, overconsumption and technological development have depleted many of the world’s natural resources, with profound impacts on the environment. This study applies the concept of criticality, which determines whether a resource may become a limiting factor to future development, to water.
Environmental specimen banks (ESBs) first emerged in the 1960s and are now essential to environmental management across the globe. ESBs sample and archive environmental specimens and can be used to identify the distributions of chemicals within ecosystems and trace their exposure over time. This study uses the German ESB to illustrate their potential for chemicals monitoring in the EU.
Intersex fish, in which male reproductive tissues become ‘feminised’, are increasingly being identified. This effect has traditionally been attributed to birth-control medications. This study exposed fish to a widely prescribed anti-diabetic, metformin. Male fish developed female sexual characteristics and reproductive rate decreased, which suggests that metformin may be a non-traditional endocrine-disrupting compound.
The BIOAMBIENT.ES project is the first human biomonitoring programme to estimate levels of environmental pollutants at national level in Spain. This study reports its findings on polycyclic aromatic hydrocarbons (PAHs), chemicals that are ubiquitous in the environment. The results will help to establish reference values, identify highly exposed populations and evaluate effectiveness of policies.
Climate change is likely to increase the frequency and severity of flooding. This study reviewed damage mitigating measures at local, regional and national scales, and suggests that approaches including both spatial planning and private precautionary measures (such as building adaptations) are important for integrated risk management.
Straw from previous harvests can be used to help increase crop yields and improve the efficiency of water use in arid regions, finds a new study from China. By testing different techniques to improve water efficiency, the researchers found that the most effective method involved using straw to cover the soil when growing maize and wheat together in the same growing season.
Water scarcity is an important cause of low crop yields worldwide. Yields could be significantly improved by focusing attention on unproductive water losses and improving retention of plant-available water in soils, and particularly the largely unexplored interactions between soils and roots. A new review of scientific literature sets out key soil management measures for crops under drought conditions.
Comprehensive data analysed in a new study show how extensive rainfall can erode soils across the EU and Switzerland, revealing that Mediterranean regions have the highest risk for erosive events and floods. The resulting dataset can also be used for disaster planning and relief.
Nutrient leaching, the movement of plant nutrients from soil to water, can have negative effects on aquatic ecosystems due to eutrophication, which reduces the oxygen available in water, causing species and habitat loss. Ecological Recycling Agriculture (ERA), which is based on ecological principles and integrates crop production and animal husbandry, may limit this effect. This study investigated the impact of ERA on agricultural fields in Finland, showing that the practice can reduce nitrogen leaching and may help to achieve agricultural nitrogen-reduction targets.
Worsening soil erosion in north-western Europe may be the result of a switch from traditional dairy farming to cash crops. However, even if all dairy farming ceased, reductions in runoff of up to 76% could be achieved if best agricultural practices are employed, at a cost of approximately €45 per hectare for the first three years, new research from the Austreberthe watershed in France suggests.
Small field wetlands are a simple and effective way to reduce soil erosion and nutrient pollution, recent research suggests. The authors adapted Norwegian designs for the UK environment and created a series of small rectangular lakes on the edges of agricultural fields. After three years, the wetlands had prevented tonnes of soil from leaving the land, and helped alleviate some of the nutrient run-off that would have affected neighbouring waterways.
In the face of substantial evidence that modern land use management practices have increased runoff at the local scale, a new study reveals changes in local land use management practices can reduce the risk of local flooding. However, there is little evidence so far that these local increases in runoff culminate in large-scale flooding effects. To address this lack of evidence, the researchers present a model that maps the downstream rate of flow back to its source areas.
Land use changes over the last century in the Mediterranean area may be sparking shifts in weather patterns locally, across Europe, and around the globe, suggests a new study. The findings bring to light new complexities that can be integrated into climate models and predictions.
Thematic Issue 52
Land use changes over time have altered relations between soils and water cycles throughout the world. Soils have been lost and degraded, and the closely interlinked processes of soils and water have become an urgent issue for European policymakers. This Thematic Issue aims to provide a review of new research into the links between soil and water issues in Europe, including a message that the soil-water links must be considered at their proper spatial scales.
Marine diesel contains sulphur compounds, which generate sulphur oxide (SOx) pollution and acid rain. Ships can use mitigating technologies to reduce their SOx emissions, but these can also have a negative environmental impact. The International Maritime Organization (IMO) introduced stringent legislation to control these, aspects of which are incorporated into EU policy. This study examined the implications of the IMO’s policy and recommends a number of design solutions to help ships comply.
Urban waterways can provide foraging opportunities for a range of bat species. However researchers have found that bats in the UK are negatively affected by high levels of invasive plant species and urban development near waterways. The researchers highlight the value these often disregarded urban spaces can have for ecosystems, and suggest ways to improve the biodiversity of waterways.
A pilot cloud-based learning platform that brings together multiple datasets, models and visualisation tools has been developed with the engagement of numerous stakeholders throughout the design process. This tool could lead to informed decisions about flood risk at the local level. These types of tools and frameworks are effective ways of facilitating better decision making.
A framework on the effects of environmental change on human migration has been developed by researchers. It makes clear that environmental change can influence migration directly but also indirectly through impacts on economic, social and political factors. The framework can be used to guide further research, evaluate policy options, or develop predictions for migration under global change, say the researchers.
Links between environmental changes and migration are extremely complex. This Thematic Issue presents key pieces of research examining the causes of environmental migration and identifying policy options for Europe in dealing with forced and voluntary relocations. The sources also examine the current state of human rights for environmental migrants and how much evidence currently exists for action at local and regional levels.
The economic viability of wastewater reuse projects could be better determined using methodology from a new study. The authors developed a five-step cost-benefit analysis framework to assess a planned wastewater reuse project within the catchment of the Yarqon River, in Tel Aviv Metropolitan Area, Israel. It was found that the scheme could have a net present value of $4.83 (€4.34) million per year. The authors highlight the relevance of identifying external as well as internal economic, social and environmental costs of such projects.
Halogenated nitrogenous disinfection by-products (N-DBPs) in water increase bacterial resistance to antibiotics, new research shows. The study found that a strain of bacteria which can cause disease in humans, Pseudomonas aeruginosa, increased its resistance to a range of different antibiotics by an average of 5.5 times after the bacteria were exposed to chemicals which form as by-products of common water treatment procedures. The results highlight the risks to public health which these currently unregulated by-products may cause.
Reducing plastic carrier bag consumption in different EU Member States requires different approaches and combinations of measures, according to a new study. The authors studied consumption and littering levels across Europe in relation to national plastic bag consumption reduction policy options, and found that there is not one specific solution for both of these factors, nor a single solution that can be used in all Member States. They suggest a holistic approach and additional research into consumer or stakeholder behaviour is needed.
Cyanobacteria — often referred to as blue-green algae — are found in water bodies around the world and can produce toxins with potential health risks. This US-wide study found a significant positive association between cyanobacterial bloom coverage and death by non-alcoholic liver disease. The researchers say their study suggests some evidence of a potential health risk and should be used to generate further investigation into the health impact of cyanobacteria.
The economic benefits of the ecosystem services provided by constructed wetlands far outweigh the costs of maintaining them, new research has confirmed. Analysis of a wetland that treats the third largest lake in Florida, US, shows that it provides ecosystem services worth $1.79 (€1.64) million per year, against costs of less than half that figure.
Despite tap water being freely available and safe in many countries, bottled water is widely consumed around the world. This has negative effects on the environment, including water wastage and pollution. This study assessed beliefs about purchasing bottled water and tested three strategies to change behaviour, showing that combining persuasive information and social pressure can create the most positive intentions to reduce consumption.
Oil spills at sea can be catastrophic events, with oil and discharged toxins, including polycyclic aromatic hydrocarbons, threatening marine wildlife and coastlines, damaging healthy ecosystems and harming livelihoods. A recent study found that using dispersants moderately decreased the number of cod eggs and larvae affected by spills off the Norwegian coast.
Reliable data regarding marine debris pollution in the Black Sea are lacking. This study provides the first account of the abundance and types of litter floating in the north-western part of the Sea. This information will help to develop effective solutions for marine litter in the region and therefore to achieve the EU objective of ‘Good Environmental Status’ by 2020.
Aeration is an effective means of eliminating antidepressants from landfill leachate, a new study finds. The concentrations of five different drugs were reduced by this treatment process, which could be an effective means of tackling the growing problem of pharmaceutical infiltration into aquatic environments.
The fragmentation of brown trout (Salmo trutta) habitat indirectly affects the threatened freshwater pearl mussel (Margaritifera margaritifera), a new study has shown. Dams and weirs, which affect the migration of the fish, also have a knock-on effect on the mussels, because they rely on brown trout during the larval stage of their lives.
The English Channel (La Manche) is one of the world’s busiest sea areas, and management of it is a challenging task. This study reviews governance across the Channel, finding poor integration between countries, sectors, policies and research. The study also considers management in terms of the ecosystem approach and suggests that linking research between the UK and France could be key to improving marine governance.
Loss of satellites providing rainfall data could have a negative effect on global flood management, according to new research. However, this could be mitigated by improved international co-operation and the use of more modern satellite technology, the authors say. The study examined the consequences for flood management of the loss of four of the existing 10 dedicated rainfall measuring satellites.
Controls on pharmaceutical production in the EU should be changed to guard against the spread of antibiotic resistance, protect wildlife and improve transparency in the industry, a team of scientists from Sweden and the UK recommends. The scientists propose 10 changes to the environmental risk assessment (ERA) of pharmaceuticals.
The contamination of hazardous substances in estuaries can have negative effects on biodiversity. Using experimentally supported indicators, this study analysed the environmental risks posed by 22 different contaminants in UK estuaries and coastal waters, finding that substances banned over 20 years ago continue to persist in the marine environment.
Plastic pollution in the ocean is a growing problem. This study, which is the first to investigate the presence of plastic debris in large pelagic fish in the central Mediterranean Sea, found that over 18% of fish had ingested plastics.
Climate change is predicted to increase the frequency and severity of flooding in coming years. For more effective flood alleviation, this study recommends schemes that consider the social impact of floods as well as the economic damages.
Zero Energy Buildings (ZEBs) are a viable means to reduce global energy demand, a new study suggests. However, in response to the drop in energy costs for the household due to better energy efficiency, people may begin to consume more energy than they otherwise would. These so-called ‘rebound effects’ can undermine emissions reductions, the study says, and it proposes approaches that could lessen these impacts.
The risk of eutrophication as a result of nitrogen and phosphorus pollution in Europe’s freshwaters fell by 22% in lakes and by 38% in rivers between 1985 and 2011, new research has shown. The researchers analysed data across 88 European river basins using a new statistical approach which could be used to help identify factors which increase eutrophication risks.
The EU Water Framework Directive1 requires policymakers to consider the management of water e.g. in rivers, lakes and streams, at the scale of the river basin, but can wastewater treatment systems be managed at the same scale? To help policymakers answer this question, a team of Spanish researchers have created a method for assessing the integrated operation of wastewater treatment plants in a river basin. Uniquely, the method considers both local and global environmental factors and an economic assessment.
Supplementing declining salmon populations with fish from other, genetically distinct populations may not be the best method of conservation, according to a recent study. The researchers found that for certain salmon populations in France such introductions resulted in offspring with lower body weight and length, possibly worsening their decline.
Microbes found in groundwater may be resilient to periods of drought. A new study measured the enzyme activity of microbes, which shows whether they are alive and active, in a groundwater well. No significant difference in enzyme activity was found between those microbes that had experienced drought for four months and those that had not.
Ireland's national agri-environment scheme can reduce nitrate leaching from beef farming, shows a recent study. Nitrate leached at an average rate of 17.3 kilograms per hectare (kg/ha) on studied plots which complied with the scheme. This compares with 63.1 kg/ha on intensively farmed plots. The programme can therefore help Ireland meet requirements of the EU’s Water Framework Directive (WFD) and Nitrates Directive, the researchers suggest.
Biodiversity is declining in freshwater ecosystems across the globe, a new study has shown. The researchers created a mathematical model, called GLOBIO- aquatic, which builds a picture of the threats to the biodiversity of rivers, lakes and wetlands that are posed by a variety of human activities. The most crucial of these are land-use changes, nutrient and chemical pollution, and disturbances to the water cycle — which could be from infrastructure such as dams, or from climate change. The authors hope that the model will help policymakers identify regions which are most at risk from these pressures.
Brown trout (Salmo trutta) embryos exposed to oestrogen during development hatched earlier, grew more slowly and had a lower heart rate than unexposed individuals, according to a recent Swiss study. These findings may indicate that oestrogen pollution in some European rivers is contributing to the decline of wild populations of such species.
Concentrations of three pharmaceuticals (ethinylestradiol, oestradiol and diclofenac), have been mapped in a recent study of European rivers. The researchers predict that levels of ethinylestradiol, a contraceptive and hormone replacement drug, could exceed the WFD's suggested environmental quality standards in 12% of the total length of Europe’s rivers
How do we safeguard both water quality and quantity? This brief looks at the best ways to recycle and re-use water, the latest water treatment technologies, and innovation within water governance itself.
Water shortages in water stressed regions can be alleviated by building large infrastructures, such as water transfer systems or saltwater desalination plants, which increase the supply of water. However, a new study, which compares the environmental impact of water supply alternatives in a region of Spain, concludes that reducing water use, rather than increasing supplies, is a more sustainable solution.
Phosphorus in sewage and manure could be more available to crops than previously thought, suggests new research. The study found that some forms of sewage and manure treatment provided plants with more phosphorus than conventional inorganic fertilisers.
More adaptive approaches to planning could help policymakers deal with deep uncertainties about the future of our planet. Researchers have developed a method for adaptive planning which they suggest could protect against failure when future predictions turn out to be inaccurate. They illustrate their approach using the case of water management in the Rhine Delta region of the Netherlands.
The health of almost half of all European freshwaters is at risk from organic chemical pollution, finds new research. The study, a continental-scale risk assessment of the potential effects of toxic organic chemicals on freshwater ecosystems, based its conclusions on data for over 200 pollutants measured at 4000 monitoring sites across Europe.
Untreated wastewater from the baker’s yeast industry can be used to irrigate crops without negatively affecting the chemical quality of the groundwater beneath, recently published research concludes. Although the wastewater increased concentrations of some groundwater contaminants in an area with a high water table, these levels would not pose a risk to human health even if this water was used for drinking.
Britain’s freshwater ecosystems are on the brink of an invasional meltdown, a new study concludes. Examining 23 freshwater species from south-east Europe, researchers investigated whether individual species in the group would ‘pave the way’ for others, resulting in a rapid increase in establishment of invasive species. The results showed that 76% of the interactions between the species were positive or neutral, highlighting the possibility of severe consequences for Britain’s freshwater ecosystems.
Anti-depressant drugs can affect the behaviour of wild animals in ways which may reduce their survival, new research has shown. The researchers fed half a group of starlings fluoxetine (commonly produced as ‘Prozac’) at concentrations they would be likely to encounter in the wild, if they fed on invertebrates contained in the waste water at treatment plants. Those fed the anti-depressant showed reduced feeding rates compared to the rest of the group, possibly putting their survival at risk.
Farmers in one of Europe’s most water-stressed regions would be willing to pay double the current amount for irrigation water in order to ensure a reliable supply, new research from Spain suggests. The study also shows that they appear unsupportive of new policies proposed by the researchers, such as water markets and tighter controls on groundwater pumping, which could help enable a guaranteed supply of water.
Unusually warm or cool Pacific sea surface temperatures, known as El Niño and La Niña, can be used to reliably predict anomalies in flood risk for river basins that cover 44% of the Earth’s land surface, a new study has shown. The researchers also quantified overall flood damage by combining information on flood risk with estimates of damage to economies and numbers of people at risk. This could help improve flood disaster planning, they say.
Nutrient pollution in The Netherlands is falling as a result of national and EU policies, new research has shown. However, many waters still routinely fail to meet environmental quality standards. The study, which focused on the headwaters of 167 rivers where agricultural fertilisers are the main cause of pollution, showed that up to 76% of these did not meet water quality standards.
A low cost, low energy method to disinfect water using electricity has been developed by researchers by combining carbon nanotubes (CNTs) and silver nano-wires with existing materials. The technology has the potential to be used in portable disinfection devices in developing countries.
Back in 1999, a group of scientists predicted how changing air pollution levels would affect the acidity of lakes and rivers in Europe in 2010 using a computer model. A follow up study has now gathered actual measurements of these waters to see if the predictions came true. The observations show that most of the rivers and lakes did recover from acidification, as forecast by the model, and demonstrate the model’s value in predicting future water chemistry, the authors say.
Wastewater produced by hydraulic fracturing, or ‘fracking’, has been chemically analysed in the most comprehensive study of its kind to date. The researchers found that produced water from three US fracking sites contained a diverse array of chemicals including toxic metals such as mercury and the carcinogens toluene and ethylbenzene. However, a group of harmful chemicals, ‘polyaromatic hydrocarbons’ commonly found in mining and coal extraction wastewater, were absent.
A drug used to treat parasite infections at fish farms can contaminate the surrounding environment and threaten local wildlife, a new study shows. Following a week-long treatment at a Norwegian salmon farm, the authors found concentrations of an anti-sea-lice drug that were high enough to kill some crabs, shrimps and lobsters. However, they suggest the drug is not likely to pose a risk to humans.
A step-by-step approach to planning cost-effective river restoration is outlined in a new study. The study describes a method that compares different combinations of restoration measures and could be useful in helping decision-makers meet ecological objectives on limited budgets.
Contamination of drinking water in areas close to several fracking sites in the Marcellus and Barnett Shales, USA, is caused by structural problems leading to wells leaking natural gas into aquifers, a new study suggests. The researchers measured trace amounts of chemicals, called noble gases, which formed signatures of the sources of gas contamination in over 130 samples. These findings suggest that, rather than coming from natural sources, such contamination in the area of the investigation is an engineering problem to do with the wells themselves, the researchers say. They stress the importance of ensuring the structural integrity of the wells, which can be done in an affordable manner.
Wastewater emptied from commercial fishing boats is an overlooked source of marine pollution, a new US study shows. The researchers suggest that this type of pollution should be given further consideration when assessing the overall environmental impact of fishing, as it may pose a risk to human health and marine life.
Flood management could be improved by including socio-demographic information in the assessment of flood risk, suggests new research. The research combined traditional flood risk assessment with information on the ‘social vulnerability’ of people living in flood risk areas. The results show that there are almost twice as many people of high social vulnerability (e.g. low-income or elderly) in flood risk areas of Rotterdam as low social vulnerability people.
Models that predict how nitrogen from the air is deposited in the sea could be useful in predicting algal blooms. Based on the knowledge that excess nitrogen increases algal growth rates, researchers simulated nitrogen deposition in the North Sea and suggested that, using predicted weather data, it might be possible to adapt this approach to predict algal blooms.
Mercury contamination of some wild fish species in areas of the Czech Republic may put anglers’ health at risk, a new study suggests. The research showed that EU-wide and Czech national regulatory limits for mercury were exceeded in at least one analysed sample at 63% of the sites surveyed. However, contamination levels varied substantially between locations and species, the researchers say.
An average shale gas well in the Marcellus formation will use around 20 000 m3 of freshwater over its life cycle, new research suggests. In total, 65% of this is directly consumed at the well site and 35% is consumed further along the supply chain
By 2070, there may be insufficient water for irrigation to ensure yields and profitability for some crops currently grown in northern Germany - if the IPCC´s worst case climate change scenario becomes a reality - new research warns. To reduce future demand for water under a changing climate, the study suggests that farmers grow different crops and change their management practices.
Citizens in countries surrounding the Baltic Sea would be willing to contribute financially towards long-term management of eutrophication, according to a recent study. Furthermore, most would like to see the Baltic Sea managed as a single whole, rather than only improving their local coastal area.
Hypoxia – low levels of dissolved oxygen – can cause genetically female fish to develop into males, new research has found. Hypoxia in aquatic environments is often the result of eutrophication, which is caused by pollution from human activities. The findings suggest that hypoxia could cause fish populations to collapse, with consequences for entire ecosystems.
Human activities are threatening river ecosystems in the Mediterranean. Recent research in south-east Spain has highlighted the need to assess biodiversity and the ecological condition of river ecosystems at both basin-wide and local scales. The researchers say this will provide a better assessment of river ecosystems, aiding management decisions.
The Baltic Sea is likely to be warmer, lower in oxygen and more acidic in the future, warn Swedish scientists in a recent study. Current strategies for managing the Sea will need to change if they are to meet marine protection objectives.
Policies to manage marine ecological quality can be improved by combining economic and ecological concerns, finds a new study. Using this integrated perspective, researchers developed a model which identified the most cost-effective options for reducing nutrient pollution in the Baltic Sea within a 40-year time-span. The total cost of meeting the commonly agreed targets is estimated to be €1,487 million annually.
From rising seas to fiercer and more frequent storms, climate change effects are putting increasing pressure on coastal populations and ecosystems throughout Europe. Human activities, such as farming and land-use changes, are already in conflict with ecosystems. However, linking ecosystem services with social preferences in coastal land-use management can lead to more sustainable resource planning, finds a new study. The researchers developed guidelines for a participatory climate change adaptation process, which integrates the social effects of adaptation measures with the ecosystem services that they affect.
Small, artificial wetlands can reduce river pollution by trapping soil and nutrients swept off agricultural land by rainfall, a recent study finds. The researchers recommend that they are used as a back-up option to soil management measures also designed to reduce runoff into rivers.
Funding for scientists, planners and inspectors should be available before any shale gas development begins, a new review recommends. As revenue for such staff is often provided by the development itself, planning, which is vital to provide immediate environmental protection as well as monitoring long-term impacts, is neglected. The researchers also advocate the use of 'adaptive management' as a decision-making framework for this complex issue.
The impacts of climate change in the Black Sea region are likely to affect agriculture in Ukraine, Romania, Moldova, Hungary, Bulgaria and Turkey, new research suggests. The number of days of plant growth was reduced in these countries as a result of reduced precipitation, increased temperatures and low capacity for irrigation to supplement water needs. A strong legal framework is necessary to deal with conflicting future demands for water, say the researchers.
Polycyclic aromatic hydrocarbon (PAH) contamination in catfish in Italian rivers has been found to exceed EC limits, a new study has found. Benz[a]pyrene, which can potentially cause cancer, was found in all samples and in 9% exceeded limits set in EU food safety legislation. Heavy road traffic and inadequately treated wastewater are the most likely cause of these high levels of PAH pollution, say the researchers.
Public participation is an essential part of integrated water management. In a recent study, researchers following the development of a UK catchment management plan found greater cooperation between land managers and environmental regulatory bodies as a result of a participatory process.
Pieces of plastic litter outnumber fish larvae in the Austrian Danube River, new research has found. This is worrying, as some fish are likely to mistake the plastic for the prey they would normally feed on. This litter may also contribute to marine pollution; the researchers estimated that at least 4.2 tonnes of plastic debris enter the Black Sea via the Danube every day.
Synthetic oestrogens in wastewater from contraceptive pills can have effects on fish reproduction and survival that worsen over several generations, new research has found. The study suggests that some fish populations may not be able to recover from levels of oestrogen pollution found in many freshwater environments.
The world's first full-scale artificial wetland designed to treat both sewage effluent and mine wastewater has been found to continuously remove high levels of pollutants, a recent study concludes. Treating both types of wastewater at the same time proved to be highly beneficial because they contain pollutants which are more easily removed when mixed together.
Climate change may increase the amount of pathogens entering bathing waters in some areas, finds a new study. The research, carried out in a lagoon in the Baltic Sea, found that, although higher temperatures can reduce microorganism populations, this is likely to be outweighed by contamination due to runoff caused by increased rainfall. The authors are currently developing a system for alerting local authorities and the public to potentially hazardous bathing water.
Changing agricultural management practices can significantly improve water quality, according to a long-term study. The researchers found that in a US lake the total amount of suspended sediment fell, and water clarity increased as a result of multiple integrated practices implemented to reduce runoff in the surrounding area. These included introducing buffer strips of vegetation and planting trees.
Eight key features for increasing the climate change resilience of water management and spatial planning projects are presented by new Dutch research. These include: focusing on the long term, integrating the projects with other sustainability measures and encouraging stakeholder participation.
Wetland biodiversity may fall under climate change, a new study suggests. The researchers' experiments indicated that, overall, plant growth in wetlands will be boosted, but a small number of plant species well suited to the warmer conditions will out compete other species. However, climate change's effects on biodiversity may be less severe if plants are able to move to cooler locations, towards the poles.
The European eel could act as an indicator of the ecological quality of aquatic environments, according to a new study. The research suggests that new pollution limits could be developed based on levels of pollutants in eel muscle, with the aim of improving the ecological quality of water under the Water Framework Directive (WFD).
Climate change will substantially increase the severity and length of droughts in Europe by the end of the century, according to new research. The study showed that some European countries could experience a reduction in river flow of up to 80% by the 2080s.
Pollution from agricultural pesticides can present a serious threat to aquatic ecosystems. Researchers have now developed a guide to identify the most appropriate measures to reduce pesticides entering waterways. It focuses on reducing pesticide entry via spray drift or runoff.
A tool to calculate the risk of food and waterborne diseases under current or future climate change conditions has been presented in a recent study. Free to use, the online tool can help guide climate change adaptation, such as improvements to water management, by estimating the likelihood of contracting four diseases under a range of environmental conditions.
Climate change adaptation measures could improve the security of some groups of society at the expense of others, a new study concludes. Climate change adaptation policies should be based on genuine democracy and investment must be fairly distributed, to ensure that all at-risk groups benefit equally, its authors recommend.
Computer models can be powerful tools when developing policies to address nitrogen pollution from agriculture. In a new study, researchers have made recommendations regarding the best design and use of these models to aid the effective implementation of European legislation on nitrogen.
Mediterranean Marine Protected Areas (MPAs) provide important habitats for the yelkouan shearwater, a species of conservation concern, new research concludes. The study examined the behaviour of the birds at sea and found that they used MPAs extensively as foraging grounds.
Acidification of water bodies can have substantial impacts on aquatic wildlife, and even after chemical conditions improve, biological recovery may lag behind. A study of Swedish lakes shows that, although their chemical quality has improved as a result of international reductions of acidifying emissions, biological recovery has been much slower in some lakes.
Crayfish plague, spread by invasive North American crayfish, is currently devastating native European populations. However, while the disease is commonly diagnosed on the basis of diseased animals, free-living infective spores can contaminate water bodies. In the first study to test detection techniques for this disease in natural waterways, researchers found that invasive signal crayfish release low levels of plague spores, allowing it to spread undetected.
Natural wetlands can provide effective long-term remediation of contamination from abandoned mines, new research suggests. The study examined a natural wetland receiving water from a copper mine in the UK, and showed that the water’s acidity and levels of toxic metals were significantly reduced once it had passed through the wetland.
The number of earthquakes of magnitude 3 or greater in the central and eastern US has increased significantly in recent years, from about 21 a year between 1967 and 2000, to over 300 between 2010 and 2012. Most of this increase seems to be linked to the deep injection of wastewater in underground wells, according to a recent review of seismic activity.
Droughts and floods can significantly damage economic growth, recent research has found. A 1% increase in the area affected by drought can slow a country’s gross domestic product (GDP) growth by 2.7% per year and a 1% increase in the area experiencing extreme rainfall can reduce GDP growth by 1.8%, according to the study. Investments in water security could help reduce this negative economic impact, say the researchers.
The public places a high value on the use of scientific information, especially regarding climate change, in the management of groundwater resources, a case study in Finland indicates. This suggests that incorporating scientific research into management policies is likely to have the support of stakeholders in the region.
Moderate levels of nitrogen in streams and rivers can make it difficult to assess the effects of pesticides on aquatic wildlife, because nutrients mask the pesticides' impacts, according to recent research. This highlights the importance of considering nutrient levels when developing measures to protect aquatic ecosystems.
Different European regions have very different diets and environmental conditions, meaning their water consumption varies widely. Despite this, switching to vegetarian diets in keeping with regional variation would substantially reduce water consumption in all areas, a new study concludes. Where people choose to eat meat, adopting a healthy diet low in oils and sugar will also reduce water consumption, although to a lesser degree.
A measure of ‘chemical footprint’ is being developed by researchers to assess the environmental impacts of the toxic chemicals released by the production and consumption of goods. The methodology, based on life cycle and risk assessment, is also designed to be linked to the resilience of ecosystems to chemical exposure.
Human water consumption has increased the frequency and intensity of periods of abnormally low flow in streams, new research suggests. The frequency of these events increased by 30% globally, largely due to use of water for irrigation, the researchers conclude.
Improvements to EU water policy have been proposed in a recent study, to help ensure that temporary rivers and streams in the Mediterranean are adequately protected in line with the goals of the Water Framework Directive (WFD). The researchers suggest new classifications for river types, and highlight the importance of distinguishing between natural and human-derived causes of intermittent water flow.
The socio-economic costs and benefits of adaptation to river flooding caused by climate change have been assessed in a new study. According to the study, adaptation measures could save €53.1 billion every year in flood-related losses across Europe by 2080.