Criticisms of conventional ag

What I believe about the future of ag is probably best summed by this statement from ATTRA about organic production practices:

No agriculture can continue to feed a growing population if it depletes or fouls its resource base. The path undertaken by conventional agriculture is ultimately a dead end in this regard, though there is an almost mystical faith that genetic engineering and other complex technologies will always triumph. Agriculture needs to be sustainable. Therefore, those who promote organic agriculture as a true alternative are well advised to do their part in ensuring that certification and regulation does not create a “compliance agriculture” in which sustainability becomes little more than an afterthought.