---
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caption: "The green band shows how global average temperature would have changed over the last century due to natural forces alone, as simulated by climate\r\nmodels. The blue band shows model simulations of the effects of human and natural forces (including solar and volcanic activity) combined. The black line\r\nshows the actual observed global average temperatures. Only with the inclusion of human influences can models reproduce the observed temperature changes. (Figure source: adapted from adapted from Huber and Knutti 2012<tbib>89032706-9386-44b8-94a9-60ec5ed95594</tbib>)."
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  display_name: 'Chapter 1: Overview and Report Findings'
  doi: 10.7930/J0QN64NJ
  identifier: executive-summary
  number: 1
  report_identifier: nca3
  sort_key: 10
  title: Overview and Report Findings
  url: ' http://nca2014.globalchange.gov/highlights/overview/overview#narrative-page-20884'
chapter_identifier: executive-summary
cited_by: []
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description: "The green band shows how global average temperature would have changed over the last century due to natural forces alone, as simulated by climate\r\nmodels. The blue band shows model simulations of the effects of human and natural forces (including solar and volcanic activity) combined. The black line\r\nshows the actual observed global average temperatures. Only with the inclusion of human influences can models reproduce the observed temperature changes. (Figure source: adapted from adapted from Huber and Knutti 2012<tbib>89032706-9386-44b8-94a9-60ec5ed95594</tbib>)."
display_name: '1.: Separating Human and Natural Influences on Climate'
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  - attributes: 'Temperature, observed, simulated, global'
    create_dt: 2014-02-21T16:10:00
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    time_end: 2005-12-31T23:59:59
    time_start: 1895-01-01T00:00:00
    title: Separating Human and Natural Influences on Climate
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report:
  display_name: 'Climate Change Impacts in the United States: The Third National Climate Assessment'
report_identifier: nca3
source_citation: 'adapted from Huber and Knutti 2012<tbib>89032706-9386-44b8-94a9-60ec5ed95594</tbib>'
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title: Separating Human and Natural Influences on Climate
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usage_limits: Copyright protected. Obtain permission from the original figure source.