(Half of these people represent industry. Half are environmentalists. Can't tell which ones? That's a good thing.) Should a bag of concrete be like an organic banana or a new chair made out of recycled wood and get "certified" as being responsibly-sourced, or "sustainable?" And if so, what's the criteria for making such a judgment, and who's making it? Those are the complicated questions…

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Cement plants are among the world's largest sources of CO2. In order to reduce their carbon footprints, either voluntarily or to comply with new environmental regulations, as well as make a buck, owners are trying out different strategies to turn their Greenhouse Gases into just plain green cash.  As far as we can tell, the…

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