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Pollution is a problem, and there's the whole problem of the spoiling of the commons, but we've addressed the pollution problem on a variety of different levels in a variety of ways, and it's worked pretty well.

Source: www.avclub.com
Pollution is a problem, and there's the whole problem of the spoiling of the commons, but we've addressed the pollution problem on a variety of different levels in a variety of ways, and it's worked pretty well.