Treaty ending use of planet-warming HFCs takes effect in 2019

If the ramping down of HFC use works as intended, it could theoretically avoid as much as an 0.5C increase in the overall global temperature. Given that the Paris Agreement has most of the world fighting to keep global warming to 2C or less in this century, that would represent a major accomplishment. There’s one catch, though: the US. The country has yet to ratify the treaty, and it might not