http://grist.org/food/climate-change-is-decreasing-farm-yields-just-when-we-need-them-to-go-up/
One of the most disturbing details included in the recently leaked IPCC report is that climate change could begin reducing farm yields worldwide by up to 2 percent a decade. Meanwhile, demand for crops is increasing 12 percent per decade.
You dont have to be a math whiz to see how that (doesnt) add up.
A collision between a rising need for food and falling yields would be terrible for the environment, as well as for people. When people are starving, they are forced to make really bad tradeoffs: You might cut down your forest to feed your kids, even if you know it will lead to landslides that might ruin your farm the next year.
But that collision only happens if we dont act, said Jonathan Foley, of the University of Minnesotas Institute on the Environment. There are a lot of things we can do to keep ourselves and, more probably, our fellow humans in developing countries from starving.