* From a German report on HFC-134a: “The time series show a significant emissions increase since 1995. This increase, which has occurred in spite of decreases in fill amounts, is a direct result of increased use of mobile air-conditioning systems in vehicles.” Its atmospheric concentration was 0 in 1990, 14 parts per trillion in 2000 and 63 ppt in 2011.—Well, why not forget about that? “Global warming is a major environmental concern . . . ,” announced a manual for American air conditioning technicians in 2012. Now for the good news: “No global-warming-based phaseouts are currently in effect for air-conditioning refrigerants in stationary applications.” Between 1990 and 2014, HFC emissions in the U.S. increased by 257.9%.