A European drive to run vehicles on biofuels instead of petrol and diesel to reduce greenhouse gas emissions is to be reviewed after concerns about its environmental impact.

The report, Wise Moves: exploring the relationship between food, transport and CO2, Tara Garnett, Transport 2000, 2003, considers the relationship between food miles and CO2 emissions within the supply chain, examining whether measures to shorten transport distance lead to greater or fewer CO2 emissions within the supply chain as a whole. Drawing upon a number of food studies, it concludes that the food chain is responsible for over 20% of the UK's greenhouse gas emissions.