R-454B contains HFO-1234yf, which has a trifluoromethyl group. Upon release to the atmosphere this ultimately forms trifluoroacetic acid, which has an extremel

R-454B contains HFO-1234yf, which has a trifluoromethyl group. Upon release to the atmosphere this ultimately forms trifluoroacetic acid, which has an extremely long residence time in the oceans (perhaps as much as millions of years, if I understand correctly).