Former New York Mayor Michael Bloomberg's foundation is donating $64 million to a Sierra Club program seeking to phase out coal-fired power plants and reduce planet-warming carbon emissions.

The billionaire media mogul announced the gift in Washington on Wednesday, two days after the Trump administration said it would dismantle the Clean Power Plan. The Obama-era air pollution rules were intended to cut U.S. carbon emissions by about one-third below 2005 levels by 2030.

Bloomberg's donation will continue his foundation's support the Sierra Club's Beyond Coal Campaign, which works to close and promote clean-energy alternatives.

U.S. utilities have phased out nearly half of their since 2011, with many switching to cheaper, cleaner-burning natural gas.

President Donald Trump has pledged to revive the nation's struggling mines.

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