A new study has confirmed that the Gulf Stream, a crucial ocean current that helps regulate climate and sea levels, is weakening. The flow of warm water through the Florida Straits has slowed by 4% over the past four decades. This slowdown has significant implications for the world’s climate, and scientists are concerned that it may be a sign of further weakening to come.
Given that we’re already losing entire island nations, I’m not sure even that will do it.
https://en.wikipedia.org/wiki/Kiribati