Open this photo in gallery: Britain's Prime Minister Rishi Sunak reacts as he delivers a speech during a press conference on the net-zero target, at the Downing Street Briefing Room, in central London, on Sept. 20.POOL/Reuters British Prime Minister Rishi Sunak has announced a major reversal of his government’s environmental policies while promising that Britain will still meet its target of net-zero carbon emissions by 2050. In a speech Wednesday in Downing Street, Mr. Sunak said Britain had come further than most countries in addressing climate change but a more pragmatic approach is now needed. “We seem to have defaulted...