Prohibited funding environmental and community development projects through corporate settlements of federal lawsuits.
Announced intent to stop payments to the Green Climate Fund, a United Nations program to help poorer countries reduce carbon emissions.
Reversed restrictions on the sale of plastic water bottles in national parks designed to cut down on litter, despite a Park Service report that the effort worked.
Proposed limiting the studies used by the E.P.A. for rulemaking to only those that make data publicly available. (The move was widely criticized by scientists, who said it would effectively block the agency from considering landmark research that relies on confidential health data.)
Proposed repealing an Obama-era regulation that nearly doubled the number of light bulbs subject to energy-efficiency standards set to go into effect next year.
Proposed changes to the way cost-benefit analyses are conducted under the Clean Air Act, Clean Water Act and other environmental statutes.
Proposed withdrawing efficiency standards for residential furnaces and commercial water heaters designed to reduce energy use.
Initially withdrew then delayed a proposed rule that would inform car owners about fuel-efficient replacement tires. (The Transportation Department has scheduled a new rulemaking notice for 2020.)