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Global Warming Global warming is an increase in the average temperature of the earth’s surface. As global warming increases, we can expect major changes in climate, water level, agricultural areas, and greenhouse gases. Since the late 1800’s, the average temperature has increased about 0.5 to 1.5 Fahrenheit degrees. Scientist disagrees about the causes and potential impact of this warming trend. Global warming affects many aspects of the environment, including sea levels, coastlines, agriculture, forestry, and wildlife. Continued global warming could have a beneficial impact in some areas and a harmful impact in others. For example, people could begin to farm in regions where it is currently too cold. At the same time, global warming could cause sea levels to rise and thereby increase the threat of flooding in low-lying costal areas, many of which are densely populated. To determine the impact of global warming, scientists must consider the rate of climate change. Many experts estimate that due to human activities the average sur