America's natural gas boom is good news for environmentalists, according to Janet Clark, Marathon Oil's chief financial officer. Gas can serve as a cheap, cleaner bridge technology and as a way to even out fluctuations in wind and solar production, according to this article. "We won't leave the hydrocarbon age because we ran out of oil and gas; we'll leave it when we have a better fuel that is scalable, that's secure and that is economically affordable," Clark says.

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