French President Emmanuel Macron issued a stark warning on climate change at a summit in Paris on Tuesday, telling world leaders “we are losing the battle” against global warming. “We’re not moving fast enough, that’s the problem,” Macron told the One Planet Summit called to boost the 2015 Paris climate accord, which US President Donald Trump has renounced. “We must all act because we will all be held to account,” Macron told the gathering on an island in the River Seine, adding: “We cannot say we did not know.” Dozens of world leaders and hundreds of ministers, company bosses, and...