Biofuels are not necessarily the greenest of fuel options

I am not surprised that the vehicles to be used on the Cambridge busway are to be biofuel-powered and predictably the buses are painted green but it is disappointing that the hype about such fuels having a ‘low carbon footprint’ has been repeated directly into your normally well informed magazine (Transit April 17). Biofuels can only be environmentally friendly if they use otherwise waste products. Even then they immediately and rapidly release into the atmosphere carbon based gases...