---
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caption: 'The green band shows how global average temperature would have changed due to natural forces only, as simulated by climate models. The blue band shows model simulations of the effects of human and natural factors combined. The black line shows observed global average temperatures. As indicated by the green band, without human influences, temperature over the past century would actually have cooled slightly over recent decades. The match up of the blue band and the black line illustrate that only the inclusion of human factors can explain the recent warming. (Figure source: adapted from Huber and Knutti, 201212).'
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  display_name: 'Chapter 34: Appendix 4: Frequently Asked Questions'
  doi: 10.7930/J0G15XS3
  identifier: appendix-faqs
  number: 34
  report_identifier: nca3
  sort_key: 340
  title: 'Appendix 4: Frequently Asked Questions'
  url: http://nca2014.globalchange.gov/report/appendices/faqs
chapter_identifier: appendix-faqs
cited_by: []
contributors: []
create_dt: 2014-02-21T16:10:47
description: 'The green band shows how global average temperature would have changed due to natural forces only, as simulated by climate models. The blue band shows model simulations of the effects of human and natural factors combined. The black line shows observed global average temperatures. As indicated by the green band, without human influences, temperature over the past century would actually have cooled slightly over recent decades. The match up of the blue band and the black line illustrate that only the inclusion of human factors can explain the recent warming. (Figure source: adapted from Huber and Knutti, 201212).'
display_name: '34.15: Separating Human and Natural Influences on Climate'
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title: Separating Human and Natural Influences on Climate
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