Abstract
Lichens, which are important components of many arctic ecosystems, are extremely sensitive to SO 2 pollution. Recent oilfield development in Arctic North America seems likely to eliminate lichens from large areas because of a unique combination of biological and meteorological factors. Probable future oilfield development in Greenland and the Soviet Union indicates that SO 2 pollution will become an increasingly serious threat to arctic ecosystems. Therefore, uncontrolled burning of crude oil, fuel oil, and natural gas, should be avoided, and adequate sulphur-extraction facilities should be installed.
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