Climate Change Shrinks Global Crop Yields, Study Finds
Climate change has caused staple crop yields around the globe to decrease significantly since 1980 according to a new study published in Science Magazine.
The research showed an association between weather trends and a 3.8 and 5.5 percent decline in global corn and wheat yields, respectively. The shortfall equals the annual yield of corn in Mexico, some 23 metric tonnes, and wheat in France, about 33 metric tonnes (Raw Story).
Using U.N. Food and Agriculture Organization data going back to 1980 for crop yields in all major crop-growing regions of the world, and pairing that with temperature and precipitation data for their growing seasons, researchers found that warming temperatures were reducing yields—although changes in precipitation did not appear to be having an effect, yet (Scientific American).
Although single digit percentages might not seem signifiant to the average consumer, chances are they’ve already noticed the consequences of this slight shift in a significant way – food prices.
The study estimates that the global drop-off in production may have caused a six percent hike in consumer food prices since 1980, some $60 billion per year.
Earlier this year, Care2′s Jaelithe Judy reported about the 2010 heat wave that led to rampant wildfires in Russia, destroying so much of the country’s wheat crop that the government banned wheat exports in alarm. That same year, unprecedented flooding in Pakistan devastated food production nationwide. Both disasters contributed significantly to higher food prices — and both were linked by scientists to global climate change.
In complete contrast to the amount of carbon emissions contributed by the United States, researchers found that it was the one “startling exception” in the study: the U.S. isn’t getting hotter, nor are its crop yields less than they might have been without climate change. Yet.
“The results are a reminder that while the relationship between crop production and climate change is obvious on a global scale, models that zoom in … on a country-by-country basis won’t necessarily see the same effects,” the researchers said in a press release.
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