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Risks associated with global warming of 1.5 to 4 °C above pre-industrial levels in human and natural systems in six countries

Author

Listed:
  • R. Warren

    (University of East Anglia (UEA))

  • J. Price

    (University of East Anglia (UEA))

  • N. Forstenhäusler

    (University of East Anglia (UEA))

  • O. Andrews

    (University of Bristol
    Wentworth Way, University of York)

  • S. Brown

    (Bournemouth University)

  • K. Ebi

    (University of Washington Centre for Health and the Global Environment)

  • D. Gernaat

    (PBL Netherlands Environmental Assessment Agency)

  • P. Goodwin

    (University of Southampton)

  • D. Guan

    (Tsinghua University
    University College London)

  • Y. He

    (University of East Anglia (UEA))

  • D. Manful

    (University of East Anglia (UEA))

  • Z. Yin

    (University College London)

  • Y. Hu

    (Southeast University)

  • K. Jenkins

    (University of East Anglia (UEA))

  • R. Jenkins

    (University of East Anglia (UEA))

  • A. Kennedy-Asser

    (University of Bristol)

  • T. J. Osborn

    (University of East Anglia (UEA))

  • D. VanVuuren

    (PBL Netherlands Environmental Assessment Agency)

  • C. Wallace

    (University of East Anglia (UEA))

  • D. Wang

    (Shanghai University of Finance and Economics
    King’s College London)

  • R. Wright

    (University of East Anglia (UEA))

Abstract

The Topical Collection “Accrual of Climate Change Risk in Six Vulnerable Countries” provides a harmonised assessment of risks to human and natural systems due to global warming of 1.5–4 °C in six countries (China, Brazil, Egypt, Ethiopia, Ghana, and India) using a consistent set of climate change and socioeconomic scenarios. It compares risks in 2100 if warming has reached 3 °C, broadly corresponding to current global greenhouse gas emission reduction policies, including countries’ National Determined Contributions, rather than the Paris Agreement goal of limiting warming to ‘well below’ 2 °C and ‘pursuing efforts’ to limit to 1.5 °C. Global population is assumed either constant at year 2000 levels or to increase to 9.2 billion by 2100. In either case, greater warming is projected to lead, in all six countries, to greater exposure of land and people to drought and fluvial flood hazard, greater declines in biodiversity, and greater reductions in the yield of maize and wheat. Limiting global warming to 1.5 °C, compared with ~ 3 °C, is projected to deliver large benefits for all six countries, including reduced economic damages due to fluvial flooding. The greatest projected benefits are the avoidance of a large increase in exposure of agricultural land to severe drought, which is 61%, 43%, 18%, and 21% lower in Ethiopia, China, Ghana, and India at 1.5 °C than at 3 °C, whilst avoided increases in human exposure to severe drought are 20–80% lower at 1.5 °C than 3 °C across the six countries. Climate refugia for plants are largely preserved at 1.5 °C warming in Ghana, China, and Ethiopia, but refugia shrink in areal extent by a factor of 2, 3, 3, 4, and 10 in Ghana, China, India, Ethiopia, and Brazil, respectively, if warming reaches 3 °C. Economic damages associated with sea-level rise are projected to increase in coastal nations, but more slowly if warming were limited to 1.5 °C. Actual benefits on the ground will also depend on national and local contexts and the extent of future investment in adaptation.

Suggested Citation

  • R. Warren & J. Price & N. Forstenhäusler & O. Andrews & S. Brown & K. Ebi & D. Gernaat & P. Goodwin & D. Guan & Y. He & D. Manful & Z. Yin & Y. Hu & K. Jenkins & R. Jenkins & A. Kennedy-Asser & T. J. , 2024. "Risks associated with global warming of 1.5 to 4 °C above pre-industrial levels in human and natural systems in six countries," Climatic Change, Springer, vol. 177(3), pages 1-24, March.
  • Handle: RePEc:spr:climat:v:177:y:2024:i:3:d:10.1007_s10584-023-03646-6
    DOI: 10.1007/s10584-023-03646-6
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    References listed on IDEAS

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