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January 15 2018

worm23
12:15
5252 0284
Reposted frommowmiwojtek mowmiwojtek viaylem235 ylem235
worm23
12:14

Sand, rarer than one thinks

Sand and gravel are mined world-wide and account for the largest volume of solid material extracted globally. Formed by erosive processes over thousands of years (John, 2009), they are now being extracted at a rate far greater than their renewal. Furthermore, the volume being extracted is having a major impact on rivers, deltas and coastal and marine ecosystems (Figure 1), results in loss of land through river or coastal erosion, lowering of the water table and decreases in the amount of sediment supply. Despite the colossal quantities of sand and gravel being used, our increasing dependence on them and the significant impact that their extraction has on the environment, this issue has been mostly ignored by policy makers and remains largely unknown by the general public.
--https://na.unep.net/geas/archive/pdfs/GEAS_Mar2014_Sand_Mining.pdf
Reposted fromalphabet alphabet
worm23
12:15
5252 0284
Reposted frommowmiwojtek mowmiwojtek viaylem235 ylem235
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