Biofuels present an attractive way to cut carbon emissions and move to more sustainable fuels, by blending crops such as sugar and corn with petrol. Gordon Brown has pledged that 5% of fuel in the UK be sourced from biofuels by 2010; but with EU ministers poised to slash targets in the face of mounting environmental concerns, are biofuels really the way forwards? Or could the hidden costs actually accelerate climate change? Cambridge University Chemical Society presents a panel debate on the role of biofuels in a post-oil world.