President Trump has made eliminating federal regulations a priority. His administration, with help from Republicans in Congress, has often targeted environmental rules it sees as burdensome to the fossil fuel industry and other big businesses.

A New York Times analysis, based on research from Harvard Law School, Columbia Law School and other sources, counts more than 90 environmental rules and regulations rolled back under Mr. Trump.

Our list represents two types of policy changes: rules that were officially reversed and rollbacks still in progress….