Anonymous ID: 40ebd3 March 8, 2019, 8:59 a.m. No.5575541 🗄️.is 🔗kun >>5575109 >>5575109 Concrete = Sand harvesting from ocean floor. More sand is extracted than fossil fuels. https://www.smithsonianmag.com/science-nature/world-facing-global-sand-crisis-180964815/ http://coastalcare.org/sections/inform/sand-mining/