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In this issue
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Lead fallout fingerprint of the Notre-Dame de Paris fire uncovered
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In 2019 the Notre-Dame de Paris cathedral fire spread leaded dust over Paris. Scientists have now uncovered a unique geochemical fingerprint of the lead dust pollution from this incident. Future studies of environmental samples of soil, air and river sediments can use the geochemical fingerprint to determine lead deposited from the fire. A large part of the Notre-Dame de Paris (NDdP) cathedral roof and spire was constructed of lead, and it was estimated that 150 kg of lead was spread during the fire by one study, with another estimating 1 tonne of lead to have fallen within 1 km of the cathedral.
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Decreasing levels of oxygen in deep lake water linked to longer warm seasons
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Monitoring has shown that summer levels of dissolved oxygen in lakes are declining. New analysis reveals that this is probably due to effects of global warming, and will be detrimental for aquatic species and potentially methane emissions. The level of dissolved oxygen is a determining factor in various aspects of aquatic ecosystems, influencing its quality as biodiversity habitat – low oxygen levels make water unsuitable for aerobic organisms (which need oxygen to breathe). In temperate lakes across the world, data indicating that average summer oxygen levels are declining are, therefore, of concern.
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Low-carbon energy construction will generate limited materials-associated emissions but can result in a high demand for key materials
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Essential expansion of low-carbon energy infrastructure will have resource and emissions implications. Researchers note that while materials-associated emissions will not threaten carbon budgets, meeting the demand for key materials may be hard. Meeting global climate targets will require rapid decarbonisation of the energy sector. This will entail construction of extensive renewable energy infrastructure, increasing both demand on raw materials and materials-related greenhouse gas emissions.
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Modelling waterborne viruses in a recreational lake could provide useful information on risk
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Assessing the health risk of virus-contaminated water should take account of virus inactivation due to environmental stressors, a new study shows. Viruses that cause stomach bugs can be present in lakes, including those used for recreation. However, viral contamination of recreational waters is rarely directly monitored and how viruses behave in lake water is poorly understood. Researchers therefore looked to assess the risk from four common waterborne viruses in Lake Geneva: adenovirus, enterovirus, norovirus and rotavirus.
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