Global Warming
The overwhelming majority of scientists agree: earth's temperature has risen during the past century But is it due to man's use of fossil fuel energy? And if so, how can we prevent the catastrophic results that some scientists predict if global warming continues? Scientists agree on many key issues underlying global warming: so-called "greenhouse gases" such as carbon dioxide (CO2) and methane trap radiation from the sun, thereby warming the earth.

But a fierce debate centers on whether this warming is a natural phenomenon or the result of man's burning of fossil fuels like coal and oil, which increase the amount of CO2 in the atmosphere. Who's right? Scientists on both sides of the global warming debate are building sophisticated computer models to predict various climatic scenarios. But, the slightest change in one variable produces a range of possible climatic outcomes, resulting in even more speculation about global warming's real impact.
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