Former New York City Mayor Michael Bloomberg gave $64 million to environmental group Sierra Club Wednesday to fight coal plants in the wake of the Environmental Protection Agency’s Tuesday decision to repeal the Clean Power Plan, the centerpiece of former President Barack Obama’s climate change agenda.

“Pollution from coal-fired power plants is the largest source of carbon emissions and kills 7,500 Americans annually, down from 13,000 when the Beyond Coal campaign began expanding in 2011 through support from Bloomberg,” Bloomberg Philanthropies said.