At Mother Jones, ‘Foodies, Get Thee to Occupy Wall Street’:

As of 2007, six companies owned 75 percent of the global pesticide market, and four companies sold half of the globe's seeds, ETC Group reckons. Here's the kicker: Three of them—Monsanto, Syngenta, and Dupont—are on both lists.

Just four companies—Cargill, Archer Daniels Midland, Bunge, and Louis Dreyfus—control up to 90 percent of the global trade in grain.