The animals and ecosystems wide scale extinction seems to be a major threat I think. It’s something people don’t seem to notice much as it isn’t in the news constantly, but 60% of wild life disappearing in the last 70 years seems like a disaster snowball that is growing fast.
I think this is the threat that will be largely ignored, and because it is purposely ignored it will keep growing in the background until it takes us all down as a storm of natural disasters.