We cannot fix our dependence on carbs if we are importing midwest grains to arid lands where people have overshot population in regards to what their landbase can support. There may be other humanitarian solutions but continuing to send them cheap grain only allows their population to grow unnaturally.
The more people we have on Earth, the more we have to rely on grains to feed everyone. The more people we have on Earth, the bigger the catastrophe is going to be when the crops fail.
To address the permaculture question from earlier and the point about Salatin's farm. In addition to being located in a wet, fertile area, remember that he has been on that farm for decades and improving those soils that whole time. Currently Midwest soils are in extremely poor shape. Yields are propped up by anhydrous ammonia use (as well as other soil additions - Calcium, etc.). Seriously, Midwest crop farming is simply soil mining. If, somehow, we decided the Midwest was going to go to permaculture, it would take a lot of work/years to get our soils back to health. Soil health = yield. The crop farmers I know will not change their system until it's too late.