It has long been known that earth is warm enough to support life because of an insulting layer of green house gases which trap the suns energy . Recently, increased production of one of these gases, CO2 by mankinds burning of wood and fossil fuels, has been the main cause of global warming if the levels of CO2 continue to increase, both temperature and sea-level could rise significantly by 2050. The speed of this change has made predictions about the effect on the worlds weather uncertain. However, computers forecast greater unpredictability and a more erratic climate. And with the temperature rise will come a corresponding expansion of water and rising sea-levels, threatening low-lying cities and fertileland alike.
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