Fossil fuels is the answer. Dead ancient foliage.
Nothing beats 'em. Ever. On price point or ease of use.
/johnny
The planet is still making the stuff..
Fossil fuels are very limited in the amount of energy they can produce. They worked great for the industrial revolution and they work great in my gas tank and furnace but I think there are certain things we will want and need to do in our future that will exceed the capabilities of fossil fuels. If we agree that fossil fuels are indeed dead ancient foliage, then we have to agree that the days of fossil fuels are numbered any way you look at it.