Submitted by alli333 on October 8, 2007

• Category: Science
• Words: 330
• Pages: 2
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Global Warming

GLOBAL WARMING



The scientific definition of global warming is the following: an increase in the Earth’s average
atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse
effect. Most of global warming is due to human activities over the past 50 years. These activities include
burning fossil fuels, land clearing, and agriculture.
The most vulnerable part of the Earth’s ecosystem is its atmosphere. There’s a thin layer of atmosphere
that traps infrared rays. The problem is that pollution makes that thin layer thicker so the rays can’t escape.
That thickened...

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