I think it's real, and I think this is going to make things difficult in some places in the world. But I'm not expecting apocalyptic scenarios.
The human being already has technologies capable of allowing him to adapt to this, and maybe reverse the worst scenarios.
I think that in the near future these technologies will not help to adapt to global warming. If in the room a person litter chill himself, then on the street he just suffocates from the heat.