This one is a particularly nasty one because it's at the pointy end of much of the benefits of spreading GM technology to the developing world. One review article found average yield increases for developing countries ranging from 16 per cent for insect-resistant corn to 30 per cent for insect-resistant cotton and an 85 per cent yield increase observed in a single study on herbicide-tolerant corn. Clearly GMOs have an important role to play in feeding a rapidly growing global population. But the scare-mongering of the anti-GM movement has led to some countries, particularly in the developing world, banning GM crops.