Last Updated: Wednesday, 9 May 2007, 08:16 GMT 09:16 UK A UN report warns that a hasty switch to biofuels could have major impacts on livelihoods and the environment. Produced by a cross-agency body, UN Energy, the report says that biofuels can bring real benefits. But there can be serious consequences if forests are razed for plantations, if food prices rise and if communities are excluded from o