PARIS his underwater photograph taken on Sept. 24, 2023 shows a sea turtle swimming among dead corals of a reef in Baa Atoll in Maldives. The world 's tropical coral reefs have almost certainly crossed a point of no return as oceans warm beyond a level most can survive, a major scientific report announced on Monday. It is the first time scientists have declared that Earth has likely reached a so-called "tipping point" — a shift that could trigger massive and often permanent changes in the