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Top Story

How much do climate fluctuations matter for global crop yields?

The El Niño-Southern Oscillation, ENSO, has been responsible for recent widespread, simultaneous crop failures, according to a new study. The finding runs counter to a central pillar of the global agriculture system, which assumes that crop failures in geographically distant breadbasket regions such as the United States, China and Argentina are unrelated. The results underscore the potential opportunity to manage such climate risks, which can be predicted using seasonal climate forecasts. The study is the first to provide estimates of the degree to which different modes of climate variability, such as ENSO, cause volatility in global and regional production of corn, wheat and soy. Such variability caused a nearly 18% volatility in global corn production from 1980 to 2010, for example. The researchers looked at the impact that ENSO, the Indian Ocean Dipole, and other climate patterns have had on global production of corn, soybeans and wheat. They analyzed how these modes of climate variability influenced drought and heat in major growing regions. The team found that ENSO can, and has, forced multiple breadbasket failures, including a significant one in 1983.

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