SHARM EL-SHEIKH, Egypt (Reuters) – With COP27 climate summit negotiations grinding over political points and technical details, delegates were hoping the G20 summit starting Tuesday in Indonesia offers a boost to ambition for global action on fighting climate change. The news on Monday of China and the United States resuming climate cooperation has already buoyed hopes for a positive outcome from the U.N. climate summit, being held this year in Egypt. But there’s still much to get done before the scheduled end of the talks on Friday. With the U.N. summit taking on the theme of “energy” on Tues…