• The average global temperature has been rising since the end of the Pleistocene.
  • Rising temperatures are natural for this time period.
  • But natural causes cannot explain all the warming that's been happening.
  • The actions involve releasing greenhouse gases into the atmosphere.
  • The more carbon dioxide in the atmosphere, the better the atmosphere can trap heat.
  • An increase in greenhouse gases leads to greater greenhouse effect.
  • The result is increased global warming.
  • As Earth has gotten warmer, sea ice has melted.
  • This has raised the level of water in the oceans about 3 mm per year.
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