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Byline: Chris Werth
It's become chic in certain circles to know your carbon footprint, but few ultragreens know what they're missing. The calculators that tally an individual's contribution to global warming rarely take account of materials that go into our homes and offices. Factories that make concrete, drywall and foam insulation are big carbon sources. Cement (a component of concrete) accounts for 5 percent of global carbon emissions.
Some new building technologies are emerging as potential alternatives. Geopolymer cements, a byproduct of steel and power ...