1887

oa Central African Journal of Medicine - World health, population, sanitation and resources: part 2

Volume 27, Issue 8
  • ISSN : 0008-9176

 

Abstract

From 1920 the world has used more energy than it has produced, and by the mid-nineteen eighties we shall be running into resource problems (Hill, 1980). To get oil from tar, the separation of oil requires a large investment; from oil shales these have to be heated to high temperatures. Using coal to produce oil, as in South Africa, is rather uneconomic. The coal is gasified and the gas turned into liquid. There is considerable difference of opinion regarding the length of time that coal will last. Meadows and colleagues think between 111 and 150 years. Hill estimates that reserves will last 250 years.

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/content/CAJM/27/8/AJA00089176_6221
1981-08-01
2019-08-23

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