The head of the Environmental Protection Agency has announced a series of actions to roll back landmark environmental regulations, including rules on pollution from coal-fired power plants, climate change and electric vehicles.

The former regulators' warning comes in the wake of the U.S. Environmental Protection Agency's announcement to roll back dozens of air and water protections.

Most of the actions are reconsiderations of existing policies, including regulations on power plants, the oil and gas industry, vehicles and wastewater. Standards for mercury, pollutants, greenhouse gas emissions and air quality are also being reviewed.