1. Global Warming
Global warming by definition is an increase in the average temperature of the earth's surface. Since the late 1800's, the average temperature has increased about 0.5 to 1.5 Fahrenheit degrees (0.3 to 0.8 Celsius degree). Scientists disagree about the causes of this warming trend. Some say that the warming trend is a natural occurrence; they say that natural process could cause the ... various causes, more heat energy reaches the surface. The rate at which the surface temperature rises is extremely important. Experts predict that the average surface temperature will rise between 3 and 8 Fahre...
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- Grade Level: High School