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Just to clear up some things that were mentioned in earlier posts:
CO2 and methane are the two major gases that are implemented in global warming. Nitrous oxide N2O also functions as a greenhouse gas. Many people would be surprised that CO2 only makes up 0.037% of the atmosphere, which has increased from 0.028% pre-1750, which is a significant increase. CO2 is normally "locked up" or "sequestered" within the ocean, soil, wetlands, and plants, approximately in that order. Deforestation results in a decrease of CO2 removal and the highly significant draining of wetlands worldwide, which function as very efficient carbon stores actually results in the release of CO2 to the atmosphere in very large amounts. These factors, coupled with increased CO2 emissions that are not letting up, result in the large increase of CO2 in the atmosphere. It should be noted that the soil, which functions as a net store of carbon, is actually the largest producer of CO2 in the world. However, it is man, through the industrial processes that is shifting the balance.
While the movie apparently shows the ice age developing over several days, it is more likely that the process would take as little as a decade to several hundred years. However, smaller changes, like the little ice age in the 1800's in Europe that resulted in the complete freezing of the Thames river (with never before seen Ice Festivals) can occur in the time frame of a few years. Nevertheless, the movie can serve to open the eyes of the public to the effects of global warming and possibly spurn some pressure on governments to take action now, rather than the day after tomorrow.