Asteroid mining

Asteroid mining is the exploitation of raw materials from asteroids.

Quotes

 * Relying on space to provide an infinite resource base into which we grow/expand forever is misguided. Not only is it much harder than many people appreciate, but it represents a distraction to the message that growth cannot continue on Earth and we should get busy planning a transition to a non-growth-based, truly sustainable existence.
 * Tom Murphy, "Stranded Resources" (2011)