An internal report put together by the World Bank and leaked to the Guardian claims that biofuels may be responsible for up to 75 percent of recent rises in food prices. Even environmental groups haven't gone that far in their estimates.

Rising food prices have pushed 100m people worldwide below the poverty line, estimates the World Bank, and have sparked riots from Bangladesh to Egypt. Government ministers here have described higher food and fuel prices as "the first real economic crisis of globalisation".

President Bush has linked higher food prices to higher demand from India and China, but the leaked World Bank study disputes that: "Rapid income growth in developing countries has not led to large increases in global grain consumption and was not a major factor responsible for the large price increases."

Secret report: biofuel caused food crisis | Environment | The Guardian