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A climate-change risk analysis for world ecosystems.

Marko Scholze1, Wolfgang Knorr, Nigel W Arnell

  • 1Quantifying and Understanding the Earth System, Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, United Kingdom. marko.scholze@bristol.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|August 23, 2006
PubMed
Summary
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Global change biology·2025

Climate change poses significant risks to ecosystems, potentially causing forest loss and altered wildfire and water patterns. Higher global warming levels exacerbate these ecosystem process changes.

Area of Science:

  • Ecology
  • Climate Science
  • Environmental Science

Background:

  • Ecosystems face increasing pressure from climate change.
  • Predicting ecosystem responses to global warming is crucial for mitigation and adaptation.

Purpose of the Study:

  • To quantify risks of climate-induced changes in ecosystem processes.
  • To analyze shifts in forest cover, wildfire frequency, and freshwater supply under various global warming scenarios.

Main Methods:

  • Utilized a dynamic global vegetation model forced by multiple climate model scenarios.
  • Grouped model runs by simulated global warming levels: <2°C, 2-3°C, and >3°C.
  • Mapped forest/nonforest shifts and changes in wildfire frequency and freshwater supply.

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Main Results:

  • High risk of forest loss in Eurasia, eastern China, Canada, Central America, and Amazonia.
  • Projected forest expansion into the Arctic and savannas; increased wildfire risk in Amazonia and semiarid regions.
  • Altered freshwater runoff patterns, with increases in some regions and decreases in others, intensifying with higher warming levels.

Conclusions:

  • Global warming significantly impacts key ecosystem processes, with risks escalating at higher temperature increases.
  • The land carbon sink may convert to a source under >3°C warming, indicating a positive climate feedback.
  • Ecosystem risks continue to rise even if atmospheric composition is stabilized, highlighting long-term climate change impacts.