Actually fossil there is also a theory that most of the petroleum is actually produced by bacteria and is far more recent than 300 million years age, and if you take a really good look around you might discover that methane (natural gas) is also frequently of more recent manufacture. I know of several abandoned and capped land fill/ dumps that are producing more than a little bit. I won't bother to mention all of the other possibilities.
Coal, does take awhile to produce but then it was trees etc.. at one time.
No matter what you decide to oxidize if it contains carbon it isn't carbon neutral.
The only possible way that we obtain more carbon is via impacts of extraterrestrial objects, what we have now will likely still be here a long time from now (the earth undergoing complete consumption from very hot items such as the sun excepted) and still slowly changing in its chemical bonding with other elements.
The bottom line on all of this is that all 6+ billion of us now on this planet will one day be fuel.
Coal, does take awhile to produce but then it was trees etc.. at one time.
No matter what you decide to oxidize if it contains carbon it isn't carbon neutral.
The only possible way that we obtain more carbon is via impacts of extraterrestrial objects, what we have now will likely still be here a long time from now (the earth undergoing complete consumption from very hot items such as the sun excepted) and still slowly changing in its chemical bonding with other elements.
The bottom line on all of this is that all 6+ billion of us now on this planet will one day be fuel.