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NOAA Study Identifies Nitrous Oxide as Top Ozone-Depleting Emission in 21st Century

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Currently, anthropogenic N 2 O emissions represent the largest contribution to ozone depletion. The study, published online 27 August in the journal Science , for the first time evaluated nitrous oxide emissions from human activities in terms of their potential impact on Earth’s ozone layer. Source: Ravishankara et al. TgCO 2 e, 9.7%).

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EPA, NHTSA issue One National Program Rule; EPA withdraws CA waiver for GHG and fuel economy

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Specifically, in this action, NHTSA is affirming that its statutory authority to set nationally applicable fuel economy standards under the express preemption provisions of the Energy Policy and Conservation Act (EPCA) dictates that such state and local programs are preempted. Earlier post.)

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CRC ACES Phase 2 report finds emissions from modern heavy-duty diesels well below required levels

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2010 engines emissions reduction relative to 2010, 2007, and 2004 US emission standards. g/hp-hr between 2007 and 2009 to a level less than or equal to 0.20 Source: CRC. Click to enlarge. For a number of the most important pollutants, levels were substantially lower than required by regulations. Background. g/hp-hr in 2010.

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Emissions of Air Pollutants down in EU-27

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The European Community’s air pollutant emission inventory report released by the European Environment Agency finds that in 2007, sulphur oxides (SO x ) emissions were down by 72 % from 1990 levels. EU-27 emissions of all four pollutants were lower in 2007 than in 2006.

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Researchers report on potential long-range atmospheric emissions impacts of increased ethanol fuel use in North America

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We then employ this revised source estimate as a baseline for assessing some potential large-scale impacts of changing ethanol fuel use in the US. The researchers then applied these estimates to analyzing two scenarios for increased ethanol fuel use in the US: A complete transition from gasoline to E85 (85% ethanol) fuel.

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HEI ACES study of lifetime animal exposure to New Technology Diesel Engine exhaust finds no lung cancer

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exhaust from heavy-duty diesel engines meeting EPA 2007 and later emissions requirements—has found no evidence of carcinogenic lung tumors. The study exposed laboratory rats 80 hours a week, for up to 30 months, to emissions from a heavy-duty diesel engine meeting 2007 US EPA standards using new filters and other control technology.

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UN Review of Recent Climate Research Concludes That Impacts Of Climate Change Coming Faster Than Anticipated

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The growth in carbon dioxide emissions from energy and industry has exceeded even the most fossil-fuel intensive scenario developed by the IPCC at the end of the 1990s. per year from 2000-2007. In 2008, the minimum ice extent was 9% greater than in 2007, but still the second lowest on record. Global emissions were growing by 1.1%