Comments by "Bo McGillacutty" (@Mrbfgray) on "Why The World Is Running Out Of Sand" video.

  1. 10 tons of sand for 1 ton of concrete??? How is that possible!? I call BS.
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  2.  @1984johnson  OK, that makes sense but it's still misleading as the other 90% is useful. Also that would mean more like 1 ton of concrete to 5 tons extracted bc concrete isn't just sand but also gravel and cement.
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