Large areas of the US Midwest have seen average temperatures drop slightly since the 1950s, in part due to farmers growing more crops and pumping more water for irrigation. However, climate change may eventually overwhelm this “warming hole,” with consequences for crop yields in one of the world's largest breadbaskets.
For decades, climate researchers have puzzled unusually cold temperatures seen in the US Midwest and Southeast since the late 1950s. Average temperatures in the region have declined slightly, even as global…