Scientists had thought that there was one potential upside to global warming: more food to feed the world.
Years of laboratory tests led them to believe that more carbon dioxide in the atmosphere could fertilize food crops such as corn, soybeans, wheat and rice, offsetting the plant-damaging effects of higher global temperatures and less rainfall.
But a new study with field tests in Illinois and other spots around the globe is challenging that assumption, suggesting that any increase in crop yields due to the buildup of greenhouse gases would be modest or nonexistent.
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Scientists had thought that there was one potential upside to global warming: more food to feed the world.
