Even assuming 10 ppb of He-3 in the lunar regolith, you&#x27;d need to process 150 tons of the stuff to get one gram of fuel.<p><a href="http:&#x2F;&#x2F;fti.neep.wisc.edu&#x2F;pdf&#x2F;wcsar9311-2.pdf" rel="nofollow">http:&#x2F;&#x2F;fti.neep.wisc.edu&#x2F;pdf&#x2F;wcsar9311-2.pdf</a><p>Mind you, if we eventually automate extraction industries the economics for a lot of things change.<p>&gt; I&#x27;d much rather have industrial machinery churning out tons of pollution on the moon then on the earth.<p>Would you pay twenty times as much for your computer in order to make that happen? And would most people do likewise? It&#x27;s the answer to that sort of question that determines whether something gets done.