Hydrofluorocarbons (HFCs) are on the way out:
The coolant phase-down would be one of the most significant federal policies ever taken to cut greenhouse gas emissions, according to an analysis by the Rhodium Group, a research and consulting firm.
By 2035, the law would help avoid the equivalent of 949 million tons of carbon dioxide, the group estimated, which is similar in scope to the extra expected emissions from Mr. Trump’s climate policy rollbacks on vehicle pollution and methane from oil and gas operations.
Read that bottom part again. One of the biggest and most important steps we could take, but it merely offsets some of the damage Trump did to our efforts to deal with climate change. Here's a short history of the EPA's efforts to control this chemical: