SHARM EL-SHEIKH, Egypt (AP) — U.S. Climate Envoy John Kerry has tested positive for COVID-19 at the U.N. climate talks in Egypt, a spokeswoman said late Friday night, the latest setback for what appeared to be stalled negotiations that were already going into overtime. Kerry’s illness was sure to add to worries about the speed of negotiations, which were scheduled to end Friday but are continuing with no clear end in sight.