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On June 17, 2025 the U.S. Environmental Protection Agency (“EPA”) published a proposed rule to repeal the amendments to the Mercury and Air Toxics Standards (“MATS”) adopted by the Biden administration in 2024.

In the first major National Environmental Policy Act (“NEPA”) case to reach the Supreme Court in almost two decades, the U.S. Supreme Court issued its decision on May 29, 2025, in Seven County Infrastructure Coalition v. Eagle County, Colorado.

On May 1, 2025, the federal government brought separate suits against both New York and Vermont alleging that these state’s “climate Superfund” statutes are unconstitutional on multiple grounds.

On December 26, 2024, New York Governor Kathy Hochul signed the Climate Change Superfund Act (“CCSA” or the “Act”) into law.

On February 19, 2025, the Council on Environmental Quality (“CEQ”) released a pre-publication version of an interim final rule (the “Interim Rule”) to rescind all of CEQ’s previous and current regulations implementing the National Environmental Policy Act (“NEPA”) alongside a memorandum (the “Memo”) to federal agencies providing guidance on how agencies should revise their individual NEPA regulations and how they should manage NEPA reviews in the meantime.

In his first two days in office, newly inaugurated President Donald J. Trump signed a flurry of Executive Orders, including several aimed at supporting the traditional energy industry.

In early March 2024, the U.S. Securities and Exchange Commission (“SEC”) finalized its climate-related disclosures rule (The Enhancement and Standardization of Climate-Related Disclosures for Investors) (the “Final Rule”).

On February 3, 2025, the U.S. District Court for the Central District of California granted a partial motion to dismiss filed by the California Air Resources Board (“CARB”), dismissing the claims that SB 253 (the Climate Corporate Data Accountability Act) and SB 261 (the Climate-related Financial Risk Act) (collectively the “California Climate Laws”) violate the Supremacy Clause and limitations on extraterritorial regulation.

After little more than a week in office, there is still plenty of speculation, but priorities of the Trump 2.0 Administration are becoming more concrete.

On December 16, 2024, the California Air Resources Board (“CARB”) released a notice soliciting comments on a number of specific questions to inform its implementation of the Climate Corporate Data Accountability Act (“CCDAA” or “SB 253”) and the Climate-Related Financial Risk Act (“CRFRA” or “SB 261”) (the “Notice”).

The International Court of Justice has been asked to issue an advisory opinion on this question, and is currently hearing submissions from States, NGOs and international organisations.