Arizona might be where the world turns for food in the future, if a United Nations prediction comes true.
The U.N.'s Food and Agriculture Organization is co-authoring a book that says prickly pear cactus might become a large food source around the world because of global warming. The book says prickly pear is a good substitute for crops that might stop growing because of rising temperatures.
The cactus is drought-resistant and easy to cultivate, and experts say almost every part of the prickly pear is edible.