In his major review of the economics of climate change (October 2006), the World Bank's former chief economist Sir Nicholas Stern noted that transport is one of the most expensive sectors in which to cut carbon emissions.
One of the most important measures currently in place to force transport fuel producers to move towards alternatives to fossil fuels has been the Renewable Transport Fuels Obligation (RTFO).
Prompted by concerns about the impact of biofuel production on food prices, a major review of biofuels was carried out in the first half of 2008 by RFA chairman Ed Gallagher, recommending a slow-down in renewable fuel target increases