There Is No Magic Bullet

Between Peak Oil, global warming, authoritarian regeimes that control most of the world's oil, and many other factors, we can't keep depending on oil (especially gas) as the fuel to run the country. So what do we replace it with? Well, we can't just replace it with one thing. There's no single fuel source that can easily replace oil. We're going to have to replace it with many things.

Ethanol probably shouldn't be one of them.

On the other hand, things like biodiesel made from waste vegetable oil are good. Gets at least one more use out of things that would otherwise be thrown away. Ideally, there should be no such thing as waste, everything should go back either as food for new manufacturing, or degrade to be food for growing more food.

More on this later.