Mr. Hollopeter says he got excited by water-blasting because it's so low-tech.
WSJ: A Cosmic Question: How to Get Rid Of All That Orbiting Space Junk?
Fracking is the process of blasting water at high pressure into shale rock to release oil or gas held within it.
BBC: US oil production 'to jump by a quarter by 2014'
Much of it resulted from volcanoes blasting out gases like carbon dioxide and water vapour, which allowed ice (also a mineral) to form near the poles of Earth, and possibly on Mars too.
ECONOMIST: Minerals
Even in America, concerns about what blasting chemicals into the ground does to the water supply are hampering some developers.
ECONOMIST: The hunt for shale gas in Europe
It's not a question of blasting them out of the skies or off the water.
BBC: Windermere's 'polluting' Canada geese to be culled
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