2011 Clean Water Act Endangered Species Act Ozone 
ESA
JUNE 14, 2021
EPA announced plans to repeal and replace the Trump administration’s Navigable Waters Rule. US Fish and Wildlife Service reverses Endangered Species Act rules. USFWS : The Biden administration moved to repeal and revise several Endangered Species Act regulations finalized by the Trump administration.
Columbia Climate Law
MAY 8, 2020
EPA of a 2015 rule barring replacement of ozone-depleting substances with hydrofluorocarbons (HFCs), which are powerful greenhouse gases. Circuit vacated the 2015 rule to the extent that it prohibited continued use of HFCs by companies that previously switched to HFCs from an ozone-depleting substance. In Mexichem , the D.C.
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