Current climate-warming trends are the result of human activity

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  1. "IPCC, Climate Change 2013: The Physical Science Basis – Summary for Policymakers (AR5 WG1)" (PDF). p. 4. Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia. 
  2. "IPCC, Climate Change 2013: The Physical Science Basis – Summary for Policymakers (AR5 WG1)" (PDF). p. 17. It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century.