The daily said the report was finished in April but was not published to avoid embarrassing the US government, which has claimed plant-derived fuels have pushed up prices by only three percent.


Biofuels, which supporters claim are a "greener" alternative to using fossil fuel and cut greenhouse gas emissions, and rising food prices will be on the agenda when G8 leaders meet in Japan next week for their annual summit.

The report's author, a senior World Bank economist, assessed that contrary to claims by US President George W. Bush, increased demand from India and China has not been the cause of rising food prices.

"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," the report said.

Droughts in Australia have also not had a significant impact, it added. Instead, European and US drives for greater use of biofuels has had the biggest effect.