The Trump administration took its first step to undo President Barack Obama's landmark climate change rule today, fulfilling a major campaign promise but likely triggering years of court fights.

The Environmental Protection Agency said it will move to repeal Obama's Clean Power Plan, a 2015 regulation that aimed to hasten the electric power industry's shift away from coal and toward greener sources of energy. EPA now contends that the rule violated federal law and would cost consumers $33 billion in 2030.

EPA will also consider writing a far less stringent replacement for the rule, even though some conservative activists have pushed for the agency to have no climate regulation at all.

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