By Kate Abnett BRUSSELS (Reuters) – Tensions are mounting ahead of this year’s U.N. climate summit, as vulnerable countries ramp up demands for rich countries to pay compensation for losses inflicted on the world’s poorest people by climate change. When diplomats from nearly 200 countries meet on Nov. 7 in the beachside resort town of Sharm El Sheikh, Egypt, negotiations will tackle how to cut the CO2 emissions causing climate change and cope with existing climate impacts, including deadly heatwaves, wildfires, rising seas and drought. But another issue is likely to dominate the talks: “loss a…