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Overview of the California climate change scenarios project


In response to an Executive Order by California Governor Schwarzenegger, an evaluation of the implications to California of possible climate changes was undertaken using a scenario-based approach. The “Scenarios Project” investigated projected impacts of climate change on six sectors in the California region. The investigation considered the early, middle and later portions of the twenty-first century, guided by a set of IPCC Fourth Assessment global climate model runs forced by higher and lower greenhouse gas emission scenarios. Each of these climate simulations produce substantial impacts in California that would require adaptations from present practices or status. The most severe impacts could be avoided, however, if emissions can be held near the lower end of global greenhouse gas emissions scenarios.

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  • Barnett TP, Malone R, Pennell W, Stammer D, Semtner B, Washington W (2004) The effects of climate change on water resources in the west: introduction and overview. Clim Change 62(6):1–11

    Article  Google Scholar 

  • Field C, Daily GC et al. (1999) Confronting climate change in California ecological impacts on the Golden State. The Union of Concerned Scientists, Cambridge, MA, and Ecological Society of America, Washington, DC

  • Hayhoe K, Cayan D et al. (2004) Emissions pathways, climate change, and impacts on California. Proc Natl Acad Sci USA 101(34):12422–12427

    Article  Google Scholar 

  • Intergovernmental Panel on Climate Change (IPCC) (2007) Impacts, adaptation, and vulnerability – contribution of Working Group II to the intergovernmental panel on climate change fourth assessment report. Available online at:

  • Meehl G et al (2005) How much more global warming and sea level rise? Science 307(5716):1769–1772

    Article  Google Scholar 

  • Nakic´enovic´ N, Alcamo J, Davis G, de Vries B, Fenhann J, Gaffin S, Gregory K, Gru¨bler A, Jung TY, Kram T et al (2000) Intergovernmental panel on climate change special report on emissions scenarios. Cambridge University Press, Cambridge, UK

    Google Scholar 

  • Schneider SH (2002) Can we estimate the likelihood of climate change at 2100? Clim Change 52:441–451

    Article  Google Scholar 

  • Wigley TML (2005) The climate change commitment. Science 307:1766–1769

    Article  Google Scholar 

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Correspondence to Daniel R. Cayan.

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Cayan, D.R., Luers, A.L., Franco, G. et al. Overview of the California climate change scenarios project. Climatic Change 87, 1–6 (2008).

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  • Emission Scenario
  • Scenario Project
  • Pink Bollworm
  • Warming Range
  • California Governor