Originally Posted by rusty70f100
A lot of ethanol do not rely on fossil fuels for heat. They use other plant byproducts.
What byproducts?
I guess it comes down to, what is more efficient? A solar cell, or a leaf? I'm guessing the leaf...
You guessed wrong. The solar cell is significantly more efficient than the leaf, though it may not have many of the additional benefits the leaves may provide.