There is a difference between 1) cross polinating or animal husbandry (which I have always thought a strange term) and 2) genetic modification of foods–the former might occur in response to “natural” stimuli (and not always with beneficial results), the latter is the forced cross breeding of plants that might not be otherwise compatible, perhaps for very good reasons. We won’t know for sure for decades. We just aren’t very good at projections in this area.