Quick sand : vimarsana.com

Natural sand is becoming a scarce resource and we might run out of it by 2050; plus carbon dioxide emissions from manufacturing cement or fired clay bricks, are increasing every year

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Souradeep Gupta , Ashutosh Dwivedi , Indian Institute Of Science Iisc , Centre For Sustainable Technologies , Sustainable Technologies , Portland , Phd , Indian Institute Of Science , Biisc ,