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The cost of one ton of that element will be presented about a billion dollars, and 25 tons of helium-3 is sufficient to provide energy to the Earthlings a year.
Now the isotopes on Earth is in small quantities, only a few tens of grams per year. On the moon the maximum budget is around 500,000 tons of helium-3.
2012-08-10 08:22:24
Source: http://www.thesciencenews.info/2012/08/scientists-will-provide-energy-earth.html