Fifty billion tons of sand and gravel are used each year – enough to build a wall 27 meters wide and 27 meters high around planet Earth – finds a new report by the United Nations Environment Programme (UNEP).
Read MoreFifty billion tons of sand and gravel are used each year – enough to build a wall 27 meters wide and 27 meters high around planet Earth – finds a new report by the United Nations Environment Programme (UNEP).
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