Earlier this week, the D.C. Circuit Court of Appeals struck down part of an EPA rule promulgated pursuant to the Montreal Protocol. The section that was struck down would have required manufacturers of HFC-134a, 
which is not ozone-depleting and which had previously been determined by EPA to be an acceptable replacement for ozone-depleting compounds, to find other replacements, because EPA determined in 2015 that HFC-134a did not “reduce overall risks to human health and the environment.” Why? … More