Just to be pedantic: I think you mean hydrocarbons (just carbon and hydrogen) rather than carbohydrates (carbon, hydrogen, and oxygen). You could probably do i

Just to be pedantic: I think you mean hydrocarbons (just carbon and hydrogen) rather than carbohydrates (carbon, hydrogen, and oxygen). You could probably do it with carbohydrates (starches, sugars) or related molecules (wood, alcohol). But I'm pretty sure that hydrocarbons is what you intended there, and it's easier to dig that out of the ground.