Top scientists warn against rush to biofuel

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Gordon Brown is preparing for a battle with the European Union over biofuels after one of the government's leading scientists warned they could exacerbate climate change rather than combat it.

In an outspoken attack on a policy which comes into force next week, Professor Bob Watson, the chief scientific adviser at the Department for Environment, Food and Rural Affairs, said it would be wrong to introduce compulsory quotas for the use of biofuels in petrol and diesel before their effects had been properly assessed.

"If one started to use biofuels ... and in reality that policy led to an increase in greenhouse gases rather than a decrease, that would obviously be insane," Watson said. "It would certainly be a perverse outcome."

Under the Renewable Transport Fuels Obligation, all petrol and diesel must contain 2.5% of biofuels from April 1. This is designed to ensure that Britain complies with a 2003 EU directive that 5.75% of petrol and diesel come from renewable sources by 2010.

But scientists have increasingly questioned the sustainability of biofuels, warning that by increasing deforestation the energy source may be contributing to global warming.