Does climate change pose a threat to food security?

Many researchers are worried that presumed future climate change will affect growing conditions around the world to the extent that varieties currently grown will not be able to adapt and will not be able to feed our growing population; with dire consequences. They argue that we need to start developing drought resistant varieties now if we are to avert catastrophic food shortages:

http://news.bbc.co.uk/1/hi/sci/tech/7817684.stm

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