Report: Water risks threaten U.S. agriculture

U.S. agriculture is at risk from climatic extremes and groundwater over-extraction, says a new report from the Environmental Defense Fund. 

The 48-page study finds growers are facing rising water-related farming costs, particularly in Midwest and Western states, according to a news release.

“Water risks increasingly form the most critical threat to food and fiber production in the U.S.,” Rachel O’Connor, senior manager of climate-resilient water systems for the Environmental Defense Fund and a lead author of the report, said in the release. “There are, however, a number of emerging pathways to counteract these threats. New technology and data platforms can significantly improve on-farm water management. Investments in aquifers as natural infrastructure can boost both drought and flood resilience. Perhaps most critically, partnerships and collaboration are vital to developing durable solutions that address the problem at scale.”

Agriculture in the U.S.  must adapt to intensifying patterns of water scarcity and excess, Kelly Suttles, senior research analyst of climate-smart agriculture for the Environmental Defense Fund and a lead author of the report, said in the release. “We’ve identified a number of promising adaptation strategies, including transitioning to alternative, economically viable crops and on-farm water recycling, that can boost both drought and flood resilience. For these strategies to take root, however, public and private sector leaders must ensure climate-smart agriculture financing solutions become readily accessible nationwide.”

Drought and riverine flooding alone caused an estimated $2 billion in annual losses to the agriculture sector in the West and Midwest, according to the Federal Emergency Management Agency’s National Risk Index, the release said. Excess water caused $10 billion in damage to the U.S. corn crop from 1989-2016.

 The report outlines a number of projected region-specific impacts:

• California’s Sierra Nevada snowpack, key to the state’s extensive agriculture sector, is projected to experience a 48% to 65% decline from the historical average by 2100.
• The Pacific Northwest’s Yakima Basin, under a severe warming scenario, faces significant predicted drops in average annual yields of key crops, including potato, alfalfa and apples.
• In the Southwest, further reduction in snowmelt is predicted to increase reliance on groundwater, placing unsustainable stress on the region’s already overtaxed aquifers.
• Kansas faces predicted declines in both groundwater and surface water due to climate-driven decreases in precipitation, increased groundwater withdrawals and rising evaporative losses.
• The Midwestern Corn Belt’s predicted increase in extreme weather — including both excessive rainfall and high temperatures — could combine to significantly disrupt crop production.
   

The authors suggest a multipronged response to these growing threats, the release said. Their analysis identifies promising pathways to sustainable adaptation via:

• Land and crop management changes, including multibenefit land repurposing, transitions to climate-resilient crop mixes and further development of soil health practices.
• Technology and decision-support tools, including OpenET, an open-access data platform that provides field-level, satellite-based evapotranspiration data; and the Groundwater Accounting Platform, a new platform for managers, growers and water users to track water availability and use in near real-time. 
• Built and natural infrastructure approaches, including on-farm water recycling and natural infrastructure for drought and flood resilience.
• Policy and funding mechanisms, including climate-smart groundwater governance and financing solutions to support climate-smart agriculture investment.