Actually,\nsmart middle eastern countries are preparing for this.\nTake Dubai as an example.\nThey are foreseeing that oil will run out at sometime in the near future. So what they are transitioning into a tourist attraction. They are infact building super luxury manmade islands in the shape of the continents, and have built a super luxury island in the shape of a palm tree!!! Since I am a proffesional soils engineer i can tell you that what they are doing there is truly magnificent in engineering terms and very smart in terms of business. \n\nSo in a way you are already right in your question. Dubai is already selling sand!!! And even more amazing, wealthy people are already buying it at astounding prices!!!