The UN Secretary-General António Guterres saw the frontline of “the battle against climate change” for himself on Thursday, by taking to the tropical waters of the South Pacific off the coast of Fiji, on a solar-powered boat. Mr. Guterres was…

The UN Secretary-General António Guterres saw the frontline of “the battle against climate change” for himself on Thursday, by taking to the tropical waters of the South Pacific off the coast of Fiji, on a solar-powered boat. Mr. Guterres was…