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Global warming refers to climate changes caused by increasing greenhouse gases in the atmosphere, which absorb solar energy from the sun and radiate heat. This results in less of the sun's energy being lost into space. Earth's average surface temperature has increased about 1.4°F (0.8°C) in a span of 100 years. By comparison, natural changes in Earth's climate occur slowly, taking thousands of years to warm or cool by just a single degree.
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