Melting Ice
According to most research, over the past 100 years, there has been a half degree of temperature increase in the earth's average temperature. This may sound like nothing, but every degree has a adverse effect on our earth's temperature. The subject todays is melting polar caps.
Basically the polar ice float by displacing large amounts of water. However, with the increase in temperature, the ice are falling into the ocean and when the ice falls, it displaces a certain amount of water and increase the water height.
Though the ice caps are the seemingly most likely to melt, that is not true. Greenland is more a possibility. If it melts, it would add 7 metres to the sea level.
Scientists predict that by 2100, sea levels would rise by a max of 20 inches, and this would have a major impact on coastal cities.
info from: http://www.howstuffworks.com/question473.htm
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