Human influence on climate clear, IPCC report says

Human influence on the climate system is clear. This is evident in most regions of the globe, a new assessment by the Intergovernmental Panel on Climate Change (IPCC) concludes.

It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century. The evidence for this has grown, thanks to more and better observations, an improved understanding of the climate system response and improved climate models.

Warming in the climate system is unequivocal and since 1950 many changes have been observed throughout the climate system that are unprecedented over decades to millennia. Each of the last three decades has been successively warmer at the Earth’s surface than any preceding decade since 1850, reports the Summary for Policymakers of the IPCC Working Group I assessment report, Climate Change 2013: the Physical Science Basis, approved on Friday by member governments of the IPCC in Stockholm, Sweden.

Full press release 

Headline Statements from the Summary for Policymakers

Summary for Policymakers of the Working Group I contribution to the IPCC Fifth Assessment Report (WGI AR5)


Full Report: Final Draft of the full Working Group I report

Technical Summary

  1. Introduction
  2. Observations: Atmosphere and Surface
  3. Observations: Ocean
  4. Observations: Cryosphere
  5. Information from Paleoclimate Archives
  6. Carbon and Other Biogeochemical Cycles
  7. Clouds and Aerosols
  8. Anthropogenic and Natural Radiative Forcing
  9. Evaluation of Climate Models
  10. Detection and Attribution of Climate Change: from Global to Regional
  11. Near-term Climate Change: Projections and Predictability
  12. Long-term Climate Change: Projections, Commitments and Irreversibility
  13. Sea Level Change
  14. Climate Phenomena and their Relevance for Future Regional Climate Change

Annex I: Atlas of Global and Regional Climate Projections
Annex II: Glossary
Annex III: Acronyms and Regional Abbreviations
Annex IV: List of Authors
Annex V: List of Reviewers