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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Climate science speaks: "Act now".

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An extensive global scientific effort culminated in a comprehensive report on the climate change crisis. This assessment synthesizes thousands of publications to inform policymakers worldwide.

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Area of Science:

  • Environmental Science
  • Climate Science

Background:

  • A massive international collaboration involving hundreds of scientists.
  • Evaluation of over 14,000 scientific publications.
  • Extensive peer review with over 78,000 comments addressed.

Discussion:

  • The report addresses the urgent global climate change crisis.
  • It synthesizes vast amounts of scientific literature.
  • The findings are intended to inform government policy.

Key Insights:

  • The scientific consensus on climate change is robust.
  • The scale of the effort underscores the severity of the issue.
  • Policy-relevant scientific information has been compiled.

Outlook:

  • Informs critical government policy decisions on climate action.
  • Highlights the need for continued international scientific cooperation.
  • Provides a foundation for future climate change research and mitigation strategies.