Even before the international Paris Agreement was completed last December, we had some encouraging news about greenhouse gas emissions. Despite an increase in global GDP, emissions were basically unchanged from 2014 to 2015. Previously, only recessions interrupted the relentless year-over-year rise of emissions. Now, an early projection for 2016 looks just about as good.
Keeping the books on global emissions and the rising concentration of atmospheric CO2 is an incredibly complex undertaking—it’s not as easy as checking your electric utility statement. The overall carbon budget for our atmosphere involves all the carbon exchanged with land ecosystems and the oceans, and there …
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