On Monday afternoon, Michael Bloomberg, the billionaire businessman and former three-term Mayor of New York City, escaped to a deserted ballroom at the Grand Hyatt, in midtown Manhattan, to talk about climate change. Moments earlier, he had announced to attendees of the Bloomberg New Energy Finance summit that his philanthropic organization was partnering with the Canadian and British governments to expedite the global eradication of coal mining. His two new partners—Catherine McKenna, Canada’s minister of environment and climate change, and Claire Perry, the United Kingdom’s minister of state for energy and clean growth—came along for the discussion.