Habitat fragmentation, whether by agriculture or the perpetual growth of the human population are directly related. More people=more farm land. More demand for food, more chemicals used to produce a higher yield. Other species are hardly considered until the first equation comes out equal. Wildlife conservation is a relatively new concept that is still struggling to gain traction in much of the world. The coffee and fruit in the winter that we all need kills many animals in south and central America.
So, the further you get in to the argument of conservationist vs agriculture, the more convoluted it becomes. We all need food to eat, whether it's organic or not, it still takes land. Would I like to see less pesticides and herbicides used (thinking of run off here), absolutely. I just don't think it will happen with an ever expanding world population and waist size.