More than three dozen states have taken sides in a court fight over the EPA's reinstatement of California's strict tailpipe emissions standards.

EPA Administrator Michael Regan is confident the electric power sector will continue cutting GHG emissions despite a challenge to the agency’s authority.

The Supreme Court’s liberals defended EPA’s power to issue “beyond-the-fence-line” rules on power plants in a challenge by the coal industry and 20 states.

The Biden administration could be close to restoring California’s authority to adopt tailpipe emission standards that are more stringent than federal standards.

The Supreme Court agreed to consider challenges to EPA’s authority to regulate greenhouse gas emissions under the Section 111(d) of the Clean Air Act.

Nevada's Clean Cars regulations will take effect in 2025, but the state is allowing auto makers to bank ZEV credits starting next year.

Feedback split along predictable lines on Washington’s efforts to adopt California’s strict standards on zero-emission medium- and heavy-duty trucks.

Nevada is seeking approval for a program to tighten vehicle emission standards and increase availability of electric cars.

New York officials told stakeholders the state hopes to adopt medium- and heavy-duty zero emission vehicle standards by the end of the year.

A new report recounts actions state attorneys general took to mitigate the Trump administration’s weakening of regulations on energy and climate.