Wheelchair struggles, scarce drinking water, $15 sandwiches and hotel price-gouging at the COP27 climate summit have sparked anger and forced host country Egypt into damage-control mode, participants at the two-week meet said. Organising a UN climate conference — which brings together up to 35,000 people from 195 countries each year — is a world-class logistical challenge, and veterans of the nearly 30-year process are used to minor inconvenience. But this year’s sprawling event in the Red Sea resort of Sharm el-Sheikh has been plagued with problems, participants say, the most basic perhaps …