Sustainable biofuels
Produced responsibly they are a sustainable energy source that need not divert any land from growing food nor damage the environment; they can also help solve the problems of the waste generated by Western society; and they can create jobs for the poor where previously were none.  Produced irresponsibly, they at best offer no climate benefit and, at worst, have detrimental social and environmental consequences.  In other words, biofuels are pretty much like any other product.