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Climate Change and the Agricultural Economy

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hisoki
16 diapositives · 309 Views · Jul 19, 2014

This report explores the economic impacts of climate change on agriculture in the United States, focusing on adaptation strategies and opportunities. It examines the projections for crop yields in relation to temperature changes, the sensitivity of economic impact estimates, and how these factors influence domestic and international agricultural markets. The findings indicate that climate change will impose varying degrees of impact across regions and stakeholders, highlighting the need for improved understanding of adaptation constraints and opportunities for farmers to mitigate risks.

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  1. Bruce Fritz Keith Weller Elizabeth Marshall, USDA, Economic Research Service Climate Change and the Agricultural Economy Agricultural Outlook Forum February 24, 2012 Keith Weller Photos courtesy of USDA/ARS The views expressed are the author’s and should not be attributed to ERS or USDA

  2. Agriculture & adaptation Photo supplied by Geovantage, Inc. Scott Bauer Cropping Systems Agroecosystems Farming Systems Domestic Markets Keith Weller International Markets Plant Systems Photos courtesy of USDA/ARS, USDA/AMS, USDA/FAS

  3. Economic impact estimates are sensitive to a number of research elements: • Scope of the Assessment • Adaptation Opportunities and Constraints • Climate and Yield Projections (and associated time horizon) • Methodology Used, Model Specification Economic Impact Assessment

  4. Scope: Adaptation options Map courtesy of NOAA Photos courtesy of NRCS/Lynn Betts Source: Adapted from Smit and Skinner, 2002

  5. Scope: adaptation constraints Doug Wilson Scott Bauer Jack Dykinga Photos courtesy of USDA/ARS

  6. Scope: Trade effects Source: UNCTAD Trade Flows for Corn Photo courtesy of USDA/ARS, Doug Wilson

  7. Several studies have underlying yield assumptions broadly consistent with the IPCC (2007) findings: • “moderate climate change will likely increase yields of North American rain-fed agriculture” • Crop productivity is projected to increase slightly at mid- to high latitudes for local mean temperature increases of up to 1 to 3°C, and then decrease beyond that. • Some studies not consistent with IPCC findings: • Kucharik and Serbin, 2008 • Lobell and Asner, 2003 Climate and yield projections Temperature/yield correlation for corn Source: Lobell and Asner, 2003

  8. Extreme Events Photo courtesy of USDA/NRCS Photo courtesy of Jace Anderson, FEMA Photo courtesy of USDA/NRCS

  9. GLOBal GDP Impact Estimates Source: Tol, 2009

  10. U.S. Farm return impacts ($millions/year) Photos courtesy of USDA/ARS, Scott Bauer Source: Malcolm et al, USDA/ERS, 2011

  11. Additional impacts due to Pest damage • Changes in returns to crop production ($ millions/year) Source: Malcolm et al, USDA/ERS, 2011 Juan Lopez Photos courtesy of USDA/ARS

  12. In the short term, existing adaptation strategies will provide substantial adaptive capacity • Some estimates point to initial benefits of a modest increase in temperature, followed by losses as temperatures increase further • No consensus on likely domestic yield responses • International impacts will be more significant • A failure to consider management costs for biotic stressors may overstate farms’ financial viability in the face of changing climate conditions • Economic impacts are variable across regions and stakeholders General conclusions Photo courtesy of USDA/ARS, Scott Bauer

  13. Impacts of climate change in the United States will depend on impacts and adaptation opportunities worldwide General conclusions • Producer and consumer impacts highly sensitive to market-mediated price impacts • Negative global yield impacts can drive global prices up • Downward pressure on U.S. consumer welfare • Upward pressure on U.S. producer welfare • Positive global yield impacts can lower world and domestic prices • Downward pressure on U.S. producer welfare • Upward pressure on U.S. consumer welfare Photo courtesy of USDA/ARS, David Nance

  14. Underlying science • Precipitation and hydrological balance projections • Carbon fertilization • Biotic as well as abiotic stressors • Climate variability and incidence of climate extremes • The impacts on crop yields and farm finances Research Needs

  15. Better understanding and treatment of uncertainty in projections • Explicit risk assessment framework • Improved understanding of the opportunities and constraints for economic and adaptive behavior • technology, finance, policy, information, and resource limitations Research Needs (cont.)