Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20
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Date
1990Author
United Nations Environment Programme
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RT Generic T1 Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20 A1 United Nations Environment Programme YR 1990 LK http://hdl.handle.net/20.500.11822/29053 PB AB TY - GEN T1 - Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20 AU - United Nations Environment Programme Y1 - 1990 UR - http://hdl.handle.net/20.500.11822/29053 PB - AB - @misc{20.500.11822_29053 author = {United Nations Environment Programme}, title = {Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20}, year = {1990}, abstract = {}, url = {http://hdl.handle.net/20.500.11822/29053} } @misc{20.500.11822_29053 author = {United Nations Environment Programme}, title = {Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20}, year = {1990}, abstract = {}, url = {http://hdl.handle.net/20.500.11822/29053} } TY - GEN T1 - Environmental Guidelines for Sand and Gravel Extraction Projects - Environmental Management Guidelines, No. 20 AU - United Nations Environment Programme UR - http://hdl.handle.net/20.500.11822/29053 PB - AB -Metadata
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The environmental impacts of sand and gravel extraction are not always readily obvious and hence have long been under-estimated. The cumulative, far-reaching effects of numerous uncontrolled operations have contributed substantially to the degradation of river and coastal ecosystems.
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