The global average temperature has increased 1.4 degrees Fahrenheit over the last 100 years. In contrast, the Corn Belt of the U.S., one of the most agriculturally productive regions of the world, has experienced a decrease in temperatures in the summer during the growing season. Known as the “U.S. warming hole,” this anomalous cooling phenomenon, which occurred in tandem with increasing rainfall, was responsible for boosting corn yields by 5 to 10 percent per year, according to a Dartmouth-led study published in Environmental Research Letters. The study is one of the first to investigate the impacts of the warming hole on agriculture.
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Source: Phys.org