The National Geographic created a diagram comparison of biofuel alternatives. This diagram is in swf format and share the CO2 emissions, price, and energy balance comparison which is produced in some countries with different plant material. Perhaps this data will give you some information to choose your biofuel for green living.
To see this swf diagram, you should click each box menu. To view all products in one comparison view, click all small boxes menu on left. You can also hear the discussion about the benefits and costs of each biofuel with Joel K. Bourne, an author of National Geographic. If you want to see it in full size, click here.
Source: National Geographic