Has anybody else thought about a shortage of sand as a global problem?
The world is running out of sand - Business Insider
The world is running out of sand — and you'd be surprised how ...
Construction is booming but fracking is also using sand as never before.
Industry experts estimate that each shale gas well requires approximately 5 million pounds of sand or other proppant for the hydraulic fracturing process.
Any thoughts on what can be used as a replacement for sand in both construction as well as fracking?
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