- Atmospheric levels of methane (CH4) are spiking, scientists report. CH4 concentrations in the atmosphere were rising only at .5ppb per year in the early 2000s. But in the past two years, they’ve spiked by 12.5ppb in 2014 and 9.9ppb in 2015. https://www.washingtonpost.com/news/energy-environment/wp/2016/12/11/atmospheric-levels-of-methane-a-powerful-greenhouse-gas-are-spiking-scientists-report/?postshare=1391481501799608&tid=ss_tw 113 comments science
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