Nature details the agricultural challenges ahead. On the latest crisis:

The world currently has more than enough food, but some 1 billion people still go hungry because they cannot afford to pay for it. The 2008 food crisis, which pushed around 100 million people into hunger, was not so much a result of a food shortage as of a market volatility with causes going far beyond supply and demand that sent prices through the roof and sparked riots in several countries. Economics can hit food supply in other ways. The countries in the Organisation for Economic Co-operation and Development pay subsidies to their farmers that total some US$1 billion a day. This makes it very difficult for farmers in developing nations to gain a foothold in world markets.

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