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Emissions of potent GHG HFC-23 have grown, contradicting reports of huge reductions

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Despite reports that global emissions of the potent greenhouse gas, HFC-23, were almost eliminated in 2017, an international team of scientists, led by the University of Bristol, has found atmospheric levels growing at record values. This would have been a big win for climate. —co-author Dr Matt Rigby.

Emissions 199
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UMD-led study finds China’s SO2 emissions down 75% since 2007, India’s up 50%; India may now be the top SO2 emitter

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Although China and India remain the world’s largest consumers of coal, a new University of Maryland-led study found that China’s sulfur dioxide emissions fell by 75% since 2007, while India’s emissions increased by 50%. Illustration: Chris McLinden, Environment and Climate Change Canada. Click to enlarge.

India 170
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MIT study finds air quality co-benefits of US carbon policies can significantly offset costs, depending upon the policy

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Air quality co-benefits are additional to climate benefits realized from reduced CO 2 emissions.). In a paper published in the journal Nature Climate Science , the MIT researchers took a systems-level approach to analyzing how climate policies influence air quality, focusing on US emissions of O 3 and PM 2.5

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Study finds fleet switch from PFI to GDI engines will result in net reduction in global warming

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A new study quantifying emissions from a fleet of gasoline direct injection (GDI) engines and port fuel injection (PFI) engines finds that the measured decrease in CO 2 emissions from GDIs is much greater than the potential climate forcing associated with higher black carbon emissions from GDI engines. —Saliba et al.

Fleet 207
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Study identifies Bakken Formation alone as responsible for ~2% of global ethane emissions

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The Bakken Formation, a shale oil and gas field in North Dakota and Montana, is emitting roughly 2% (about 250,000 tons per year) of the globe’s ethane, according to new study led by researchers at the University of Michigan. Hydrocarbons react with NO x and sunlight to produce ozone. Ground-level ozone leads to poor air quality.

Global 150