President Trump ran on a campaign that promised to bring the coal industry back in America. But to billionaire mogul, former New York City mayor and philanthropist Michael Bloomberg, that’s an empty promise given that long before climate change activists began railing against it, the industry was on a downward trajectory because of technology and cheaper alternatives like natural gas. In 2015, the founder of the privately-held Bloomberg L.P. asked top lieutenant Katherine Oliver to back a film that could explain the issue from both sides — the workers displaced when coal plants close and the health costs of the polluting industry when they remain open. The result is Michael Bonfiglio’s From the Ashes, one of the environmental-themed contenders in this year’s Oscar documentary feature race.