1. Several factors play a role in producing global warming: the presence in the environment of increasing quantities of high carbon dioxide, methane and other gases, thinning of the ozone layer in the stratosphere.
2.Thinning of the ozone layer caused from the beginning, highly visible effects: increasing the number of people with severe burns after a moderate exposure to sunlight and dramatic increase in the number of people suffering from skin cancer.
3. Climate change is announced by special weather phenomena, which is manifested in recent years with increased amplitude and increased frequency. The newscasts are increasingly frequent reports about droughts and floods accompanied by landslides, hurricanes or tornadoes, blizzards and "carp stone cold" or heat "liquefies the asphalt. Scientists argue that responsible for the exacerbation of these extreme events is the phenomenon of global warming.
4.Climate models developed by experts in the field estimate that the global climate will warm by 1.1 to 6.4 ° C during the 21st century. Estimates vary because of the fact that it can not be predicted evolution of gas emissions that cause greenhouse effect.Moreover, the tendency to continue heating the planet in the XXI century is revealed by many studies in the field. Very worrisome is that these climate scenarios show that the polar areas will warm the most, which could have dramatic consequences.
5. Global warming begun around the sixties, after massive industrial development and the increase of greenhouse gases amounts that are considered largely responsible for this phenomenon.
6.and 7. To avoid a bleak future of the planet, it should,by 2050, greenhouse gas emmisions to decrease twice at global level and four times for industrialized countries.
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