Recently the United States and China agreed to a carbon emissions reduction deal to combat global warming. Under the terms of the deal, the US agrees to reduce emissions by 26% to 28% from 2005 levels by 2025, while China agrees to reach peak emissions by 2030, and to generate 20% of its energy with zero-emissions technology by that year. Diplomacy is notoriously difficult, and consequently any deal on climate change heartens those who watch international politics. But are these emissions reductions sufficient to avert the worst of what global warming potentially has to offer? I’m not seeing much coverage of the deal from a climate science perspective, so I decided to look into it.