Top Pro & Con Arguments


Natural changes in the sun’s activity cannot explain 20th century global warming.

The amount of solar energy received by the earth goes up and down in cycles, but overall there is no net change since the 1950s. There has, however, been a big increase in global temperatures that is too large to attribute to the sun. For this reason, NASA and other scientists say the sun is not responsible for global warming. [28] The sun has had only a minor effect on the Northern Hemisphere climate over the past 1,000 years, and global warming from human-produced greenhouse gases has been the primary cause of climate change since 1900. [26] A study found that solar activity could not have contributed to more than 10% of the observed global warming over the 20th century. [27]

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