By Bradford Plumer Sometime around 2050, there are going to be nine billion people roaming this planet—two billion more than there are today. It's a safe bet that all those folks will want to eat. And that's... an incredibly daunting prospect.

The 107 million tons of grain that went to U.S. ethanol distilleries in 2009 was enough to feed 330 million people for one year at average world consumption levels. More than a quarter of the total U.S. grain crop was turned into ethanol to fuel cars last year.

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Rome, Italy (CNN) -- Somewhere in the world, a child dies of hunger every five seconds -- even though the planet has more than enough food for all.

Food production will have to increase by 70% over the next 40 years to feed the world's growing population, the United Nations food agency predicts. The Food and Agricultural Organisation says if more land is not used for food production now, 370 million people could be facing fa