In fact, availablility of the raw materials for bio-diesel is much more widespread than that of petroleum.
anyway, I'm gonna stop now before this become political.
Not if you are talking about waste vegetable oil. That is a by-product of fast food restaurants and to my knowledge, there aren't many of those in central Africa or Siberia.
waste oil does not come exclusivly from fast food stores. One of the primary food items in Niger for instance is peanut cakes fried in peanut oil. and man, if i were living in siberia you can bet I will be eating one hell of a lot of fried food. meanwhile there isn't a lot of petroleum in delaware or vermont or california for that matter. pretty much every human culture has a food oil crop, if not several. and the technology required to produce food oil is a big heavy stone, some vessels to hold and 'ferment' the resultant juice and another vessel to store the oil. Add to that the technology to produce fuel from that oil, at it's most basic a way to filter out the chunks, a little more advanced tech involves a few large vessels and a heat source and some lye, this produces diesel usable in any diesel engine along with glycerin which can be composted into excellent fertilzer or made into soap, waxes and other valuable consumer goods. and, on top of all that, as long as the sun keeps burning there will always be more plants to turn into oil to turn into fuel. whereas we will even be out of coal in 500-600 years.
damn, that was aweful close to politics. alright, RBM, you think what you want to think and I will think what I want to think and our grandchildren can (maybe) argue over whether I was right or you were. in the meantime, I will fill my car with 100% renewable, slightly more expensive fuel whenever possible.