Biofuels: where next?

Could the world ever be powered from waste? Growing crops for fuel instead of food remains controversial, but biofuel technology is advancing. What's the future when it comes to biofuels? Presented by Bryony MacKenzie. Featuring Glenn Hurowitz, Mighty Earth; Leo Pontes, Raizen; Dr Jem Woods, Imperial College London; Matt Herman, National Biodiesel Board; Matthew Tipper, Shell.See omnystudio.com/listener for privacy information.