I think this is really the most terrifying thing on climate change that I've read recently. If the Gulf Stream collapses, we are well and truly screwed, and I don't see how we stop it.
It's so infuriating knowing we could have collectively stopped things, like we did with the ozone layer in the 80s and 90s, but there was no financial incentive to do so, like there was with getting rid of CFCs (there was a cheaper alternative that had just been developed iirc), so politicians and companies have done exactly jack and shit.