I think ironically this causes the Jetstream and polar vortex to breakdown, the polar vortex is what keeps arctic air from dipping further south, if the vortex fails we could be ushered into an ice age where the feedback loop is reversed. more ice, more reflection, more ice. at least that's what I learned on a YouTube video recently (some meteorologist channel).

it's amazing how many runaway feedback loops can take us to extreme heat or cold near the extinction line either way. I think we could weather an ice age, but I think billions wouldn't make it. We'd create underground homes with lights to grow food or something in a space station or on the moon.

We're pretty resourceful, I think it'd take more than that to take us out. An asteroid is much more certain extinction, unless we do have an actual colony in space or on the moon.