For many years, petroleum has been regarded as the cheapest source of liquid fuels by many countries, especially the United States and Canada. However, with the recent energy crises and concern over future supplies of gaseous and liquid fuels in many parts of the world, particularly Western Europe and North America, we have seen a gradual acceptance by the petroleum industry and the general public of the inevitability that petroleum and natural gas will, at some time within the foreseeable future, be in very short supply.
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