‘Last, best hope:’ Leaders launch crucial UN climate summit

People walk past a wall with a message on climate eduction Sunday at the COP26 U.N. Climate Summit in Glasgow, Scotland. (AP Photo/Alastair Grant)

GLASGOW, Scotland — A crucial U.N. climate summit opened Sunday amid papal appeals for prayers and activists’ demands for action, kicking off two weeks of intense diplomatic negotiations by almost 200 countries aimed at slowing intensifying global warming and adapting to the climate damage already underway.