> Water from precipitation is a fraction of the water needed in areas like the American central plains where the Ogallala Aquifer has been pumped out for decade

> Water from precipitation is a fraction of the water needed in areas like the American central plains where the Ogallala Aquifer has been pumped out for decades This isn't true. Much (at least a couple of years ago, most) corn in the midwest is not irrigated. Rainfall is common enough over the summer that it almost always works out OK, and if it doesn't, you write it off to crop insurance. Edit: double checked, still confident. Check out the page 4 map of the midwest and % of irrigated corn fields https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=2848&context=usdaarsfacpub https://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=2...