Science

The problem comes in the developing world that have a mixture of big farms run by rich landowners and small farms on marginal land owned or rented by subsistence farmers.

The big guys use the GMO seed because the crop yields are greater. They buy seed every year because those big yields produce sterile seed, Monsanto's way of protecting their intellectual property. No problem, the big guys can afford it. The small farmers need to save seed from one crop to plant the next.

The problem is that the pollen from the big GMO fields drifts over to the small farmer's field. That reduces the amount of his saved seed that will grow the following year. Even products advertised as "non GMO" have failed testing becuse the fields have been contaminated by GMO pollen which produced sterile seed for them, too.

I think we can all see the problem here. There is also nothing we can do about it, not yet.