Changes

[[Image:Rogerrevelle.jpg|thumb|right|200px|[[Roger Revelle]]]]

[[Image:Rogerrevelle.jpg|thumb|right|200px|[[Roger Revelle]]]]

'''Global warming''' is the increase of temperature since 1880. This increase in temperture is mainly caused by the increases in [[carbon dioxide]] and other [[greenhouse gas]]es. During the last century near surface tempertures rose about 0,8 K. The possibility of adverse consequences has become a major concern for some environmentalists.

'''Global warming''' is the increase of temperature since 1880. This increase in temperture is mainly caused by the increases in [[carbon dioxide]] and other [[greenhouse gas]]es. During the last century near surface tempertures rose about 0.8 K. The possibility of adverse consequences has become a major concern for some environmentalists.

According to geologists, the Earth has experience numerous [[ice age]]s during which the temperature dropped so far that [[glacier]]s could cover [[North America]] and [[Europe]].  

According to geologists, the Earth has experience numerous [[ice age]]s during which the temperature dropped so far that [[glacier]]s could cover [[North America]] and [[Europe]].