tombrokawwriteup

tombrokawwriteup - Trevor Nestor Period 1 Tom Brokaw on...

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Trevor Nestor Period 1 “Tom Brokaw on Global Warming” Video Write-Up Most climate scientists today agree that the Earth’s average temperatures are on the rise. Glaciologists have noticed that in the last seven years, many glaciers have lost ten percent or more of their mass; a historically fast rate. Once there were one hundred and fifty glaciers in Montana, now there are few as forty. In the summer of 2002, a chunk the size of Rhode Island broke away from Antarctica, and still today ice in the region is melting at an astounding rate. Ice cores are taken from ice sheets such as those found in Greenland to analyze changes in atmospheric composition. When ice is formed, bubbles of gas are encased inside the ice and act as time capsules for scientists. Scientists have noted that as carbon dioxide levels are increased in the atmosphere, so do temperatures due to the greenhouse effect. Most of the hottest record- breaking heat waves have occurred in the time after 1980. To make matters worse, one of
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This document was uploaded on 11/19/2010.

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tombrokawwriteup - Trevor Nestor Period 1 Tom Brokaw on...

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