It's genetically modified crop seeds that will contribute to the starvation in developing countries.
India is one of the countries that has had the foresight to ban the use or sale of seeds modified to produce crops with a "terminator gene". This gene does not allow a plant to produce any seeds as part of its natural cycle. Thereby forcing the farmers to buy fresh seed from the company that produced the seeds with the "terminator gene" in the first place. It's like a marketing tool from hell.
The problem arises when these plants are cross-pollenated with "normal" plants and the gene is passed on to other crops that are not under the control of the farmer. This is going to be a huge problem in the future.
How are you going to tell a bee, "No, don't pollenate those plants."
Then that's obviously not what they're protesting against.
In other countries, if the production of the terminator-gene crops aren't sufficiently higher than the "garden variety" crops to justify the added cost of buying seed each year, they will fail in the marketplace.
Furthermore, it was the Greens who pushed for terminator genes in the first place. They were the ones who insisted that GM organisms not have the ability to propagate continually through the environment. To hear them cry foul against the terminator gene for environmental reasons rings awfully hollow.
As for cross-pollination, that may or may not be a serious problem. It remains to be seen. If it renders some fraction of ostensibly non-GM seed corn unusable, I would hope that the manufacturer would be made to compensate the affected farmers. If it really gets disruptive, the crops can be banned then (on the basis of solid data, rather than simply fear). The seed corn problem will then correct itself in one planting season.