I agree with that guy, our economies will collapse, our civilization will stagnate. But no way will this lead to our extinction (unless it breeds a superbug).

I agree with that guy, our economies will collapse, our civilization will stagnate. But no way will this lead to our extinction (unless it breeds a superbug). The biggest issue I see is that the already tropical areas of the world will become unsustainable for farming. How are we going to move these billions of people out of there newly created deserts. Of course, such changes are going to be slow and visible beforehand. It will happen over the course of decades if not a century. I wonder if we will make a world government and allow people from those regions to immigrate to places that are currently frozen tundra. So, allow mexicans to go to Canada?