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10 surprisingly easy sources of alternative energy

By: Bryan Nelson on Nov. 30, 2009, 11:27 a.m.
A full moon on July 23, 2013

Photo: Chris Isherwood/Flickr [CC by SA-2.0]

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Mining the moon

Helium-3 is a light, nonradioactive isotope that has immense potential to generate relatively clean energy through nuclear fusion. The only catch: it is rare on Earth but abundant on the moon. Many projects are underway to mine the moon for this resource. For instance, the Russian space company RKK Energiya announced that it considers lunar helium-3 a potential economic resource to be mined by 2020.