The United States faces risks as well. Midwestern and southwestern states have been in a prolonged drought that might well be the result of long-term warming, and the farm states rely heavily on water from a huge underground reservoir that is being depleted by over-pumping.
美国也面临着同样的危险。中西部和西南部各州经历了很可能因为长期变暖而导致的长期干旱，农业大州的经济非常依赖于大型的地下水库，但水库的水量却因为过度抽取正在日益枯竭。