I agree that it is hysteria. There are two issues here.
1. The earth is warming. There is some scientific data that would show that the earth has warmed slightly less than 1 deg C over the last 100 years.
2. Man caused it to get warmer.
It is the jump from 1 to 2 that I think is the hysteria. The computer models used to project all the future warming don't include things like cloud cover(because we can't predict cloud formations, because we don't understand them), don't include precipitation (because we don't have any idea how much precipitation falls on any given day), or any number of things that have a tremendous impact on climate. By the way, wasn't there an ice age before the industrial revolution? Didn't the earth get significantly warmer after that? I am just saying that there is some historical evidence for significant climate change outside of man's impact.
Some pompous washed up ( and sore loser) windbag former politician makes a movie and suddenly global warming is a FACT!