global warming is in fact true in a scene ok for thousands of years our volcanoes have been producing Alot more of the harmfull fumes that deplete the ozone layer it is not our burning of fossil fuels that couses it.
thats how global warming works
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this is what is really going to happen
well every 10 thousand years our polar caps reverse (North becomes South etc...)
now we are way over 10,000 years (i personally dont know why)
but anyway when the shit hits the fan basically it will all go down in one year, not like 10's of years like in the movie, within 1 year our entire planet will freeze over DRASTICALY (if my memory serves me right around -100 to -150
and basically most humans will be killed off, but the ones who survive will basically get pushed back into the stone ages for along long time. this "Ice age" will last for another 10,000 years (i think?) basically the ones who survive this will eventually what we call "Cave Men" in our past.
