The U.S. ratifies treaty to phase down HFCs, gases trapping 1,000x more heat than CO2By Laura Benshoff (NPR)Sept. 21, 2022 10:24 p.m.📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up