(a) How is the global average surface temperature today different from what it was in 1900 (overall change)?  (b) Describe in more detail how the global average temperature has changed between 1900 and today.  You should specifically address the five specific time periods shown below in your answer. Describe the temperature changes during each period.  For each of the time periods, indicate whether or not they support the claim that temperature changes since 1900 are directly related to the changes in the concentration of greenhouse gases in the atmosphere.  Briefly explain your answers. Some periods may partially support both sides. Periods are listed below: 1910 - 1940 1940 - late 1970s 1980 - 2002 2002 - 2013 2015 - 2020

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