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  #1  
Old Posted Aug 9, 2018, 8:48 AM
dinahshorter972 dinahshorter972 is offline
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les risques de l'extraction excessive de sable

les risques de l'extraction excessive de sable

Pourquoi le risque, car l’exploitation massive du sable et du gravier a non seulement épuisé les ressources naturelles, provoquant l’érosion, l’érosion des berges, le rétrécissement des terres, la modification du débit de l’eau elle-même Cependant, cela affecte également les travaux de construction de la rivière et des digues, ce qui affecte gravement l'environnement. En même temps, mettre en danger la vie et les biens des personnes vivant dans les environs et les moyens de transport par voie d'eau, provoquer l'insécurité, ordonner et susciter une opinion publique urgente.
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  #2  
Old Posted Aug 19, 2018, 6:41 PM
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To my knowledge, there's too much sand in North Africa, namely over the Sahara region.

The desert has even been gradually nibbling fertile lands further to the south, which is a major concern, potentially a complete disaster to the Sahel.

But then, sand is probably not valuable enough to be shipped to other continents from there.
Shipping copper or zinc on long distances is economically reasonable and profitable.
Not sand yet.
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  #3  
Old Posted Dec 28, 2020, 3:59 PM
binhminhdanh2 binhminhdanh2 is offline
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Old Posted Dec 28, 2020, 4:00 PM
binhminhdanh2 binhminhdanh2 is offline
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Old Posted Dec 28, 2020, 4:01 PM
binhminhdanh2 binhminhdanh2 is offline
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Old Posted Dec 28, 2020, 4:01 PM
binhminhdanh2 binhminhdanh2 is offline
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Old Posted Dec 28, 2020, 4:02 PM
binhminhdanh2 binhminhdanh2 is offline
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Old Posted Dec 28, 2020, 4:03 PM
binhminhdanh2 binhminhdanh2 is offline
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Old Posted Dec 28, 2020, 4:03 PM
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