Ah.. The old "If you're not hungry, thank a farmer" routine. It's not about "Feeding America" it's about money. Ecological responsibility could be place on agriculture business without any disruption to the US food supply. 20% of US corn is exported, 5% of our corn crop is used to make High fructose corn syrup, about 38% for ethanol production, 37% of corn is used in livestock feed. A whopping total of around 5% of the entire US corn crop goes into human food besides livestock.
44% of soybeans are exported. The vast majority is crushed and used to make oil. About 3% of the soybean harvest used in US is not crushed for oil and goes to seed, feed, human food, and industrial uses. Most vegetable oil is made from soybeans and standard high yield soybean varieties are not suitable for many human food uses other than oil.
If sound measures of ecological responsibility were placed on US grain farmers to protect our country; the US food supply shouldn't be short one kernel. Granted, we might not have as much coca-Cola, french fries and processed / boxed, crap food but the US food supply wouldn't feel much of an impact from some simple ecological regulation. This would severely impact exports however. But why in the world would we risk impacting Americas soil and wilderness over feeding some hungry commie in China and making vegetable oil. Because at the end of the day it isn't about feeding America, preserving our wilderness and lands, it's all about money.