In a world plagued with worries about depleting resources, having enough dirt to go round seems like the least of our problems. David Montgomery dissents.

Oil is what most of us think of as a strategic resource, yet in the long run it is soil which is the more important. Even so, people's eyes tend to glaze over when talk turns to soil conservation, maybe because it's so much easier to see the immediate relevance of rising gas prices and climate change in these days of peak oil. So while public attitudes on climate change have shifted dramatically over the past few years, a crisis in global agriculture remains hidden: we are, and have long been, using up the supply of topsoil we rely on to grow our food.
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You may not want to think about what goes into your fast food, but a new study may at least put your overactive imagination to rest: It's mostly corn. The researchers analyzed hamburgers, chicken sandwiches, and fries from McDonald's, Burger King, and Wendy's and determined that nearly all of them could be traced to the corn industry– in the form of corn feed or corn-based oil. "If you put any money into fast food, it all goes back to corn, everything. The first step to making hamburgers is making an ear of corn," said Hope Jahren, lead author of the study [Des Moines Register].
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