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.
Relevant xkcd: https://what-if.xkcd.com/8/
I love how unnecessarily dark that became after the answer to the direct question ended up being boring