The National Highway Transportation Safety Administration (NHTSA) and the U.S. Environmental Protection Agency (EPA) have proposed a new reading of the Energy Policy and Conservation Act of 1975 (EPCA) that governs federal fuel economy standards. The regulations would relax federal greenhouse gas tailpipe standards and fuel economy standards, and preempt emissions standards put in place by California and adopted by other states.

Federal dams have been the focus of major disputes involving application of the Endangered Species Act (ESA), especially its §7 prohibitions on federal actions causing jeopardy to protected species. Operating agencies and project beneficiaries have sought to keep the ESA from restricting dam operations, including by arguing that such operations are non-discretionary and thus exempt. In proposing new ESA implementing rules, the Trump Administration suggested, but did not formally propose, that ongoing federal actions should be considered part of the “environmental baseline” for §7 purposes.