Congressional backers of a curb on super-polluting hydroflurocarbons tried but failed to add the measure to the U.S.-Mexico-Canada trade deal.
The language to cut hydrofluorocarbons was in line with a global deal reached in 2016 with strong support from the Obama administration, but never sent to the Senate for ratification. Hydroflurocarbons (HFCs) are highly potent greenhouse gases that are used in refrigerators and air conditioners.
That failure has led one Republican senator to vow to take up the issue directly with President Donald Trump.
Some House and Senate Democrats this week raised the prospect of one more “Hail Mary” pass—adding...