Global Warming | Natural Factors Cause Global Warming

In the following viewpoint, John Carlisle contends that the global temperature increase of 1.5 degrees Fahrenheit over the last 150 years has been caused by natural fluctuations in the earth’s temperature and has not been the result of human activity. Carlisle describes periods from the earth’s geologic history that had temperatures warmer than the present average of 59 degrees Fahrenheit, illustrating a continually changing climate system. The author believes that humanity will benefit from a warmer planet, enjoying longer growing seasons and higher-yield harvests. Carlisle is the...

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