Some more food for thought in regard to biofuels:
Yet another cautionary example that biofuel production is far from being environmentally benign. Amidst the back and forth commentary for and against biofuel production and use, a biofuel crop case study out of Hawaii suggests many plants pose a serious threat to ecosystem biodiversity.
New news? Not really, but when placed in the context of the EU's renewable energy goals (pdf)--which include increasing the share of renewables in energy use to 20 per cent by 2020, and a minimum 10 per cent share for renewable energy in transport by 2020--the question of how this is being addressed continually arises.
You may be thinking, Hawaii isn't in the EU. Quite right. The Hawaiian study just so happens to carry universal application for all tropical and subtropical ecosystems. And those exist around the globe.
Link:
http://www.energyboom.com/biofuels/invasive-bioenergy-crops-could-threaten-plant-biodiversity