"As a people, we have the problem of making our forests outlast this generation, or iron outlast this century, and our coal the next; not merely as a matter of convenience or comfort, but as a matter of stern necessity."

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There's no such thing as clean coal. It's non-existent. Theoretically, it might be possible, many years from now, to come up with a way to clean it as it's burnt. But there's not a single demonstration project in the United States. [...] Clean coal doesn't exist.

— Al Gore