As presently used throughout the world, diesel fuel isobtained almost exclusively from crude oil/petroleum.Reserves of some 150 billion tons of petroleum are exploitableat this time. However, this amount is dependent on thetechnology available, which has advanced dramatically, andon the capital available for exploration and extraction. Themore crude oil costs on international markets, the morecapital can be raised for exploration, development, produc-tion and transport. At the same time, this also increases theopportunities for alternative and hitherto uneconomical rawmaterials and manufacturing processes. The ratio betweenannual extraction and definitely exploitable reserves is a para-meter that measures availability. At present, it is assumed thatthe reserves will last approximately 40 years
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