Climate change is the environmental problem that obsesses us, the one that's the focus of high-flying international summits and hardcore national politics. But it's not the only environmental problem — and it's not even the biggest one. That happens to be the crisis in agriculture and land use, the subject of what Jon Foley — the head of the University of Minnesota's Institute on the Environment — calls the "other inconvenient truth." Put simply, the act of feeding 7 billion plus human beings already puts more stress on the planet than any other single activity — and with both population and global wealth continuing to grow, we're going to need to figure out a way to produce more food without further damaging the environment. Otherwise we may end up running out of both food and the planet.

Of course, exactly how we should address these problems is the subject of fierce debate in the U.S. and beyond. Is the solution to go organic as much as possible, or should we focus on trying to extend the fertilizer and irrigation of the Green Revolution to underperforming agricultural areas in Africa and Asia? Do we need to change our diet and reduce meat consumption, or is it simply unrealistic to expect more of us to become semi-vegetarians — especially among the rising global middle class just getting a chance to eat like Americans? How much value do intact forests and wildlife habitat have as we struggle to feed the 1 billion people who go to bed hungry each night? And is it really food production we need to improve, or distribution?

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