In my opinion why we get bad weather disasters is because it's a punishment for all the time we had and still are destroying earth.
No, it's heating up. what eventually will melt the icecaps that will create cold water currents and cool everything down. But before this happens, we'd first be enjoying very hot summers where you can boil water outside.
Not yet, but presumably most of us will be dead before it gets to that point. That's why its called global warming.