Like many cities, Denver's largest source of greenhouse gas emissions is its buildings. Heating and cooling skyscrapers requires a lot of fossil fuels. Now, the city is trying a surprising solution.
Denver plans to heat and cool a cluster of downtown buildings with a system using water, geothermal energy and even heat from ... sewage.
Aaron Ontiveroz/Denver Post via Getty Images
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Aaron Ontiveroz/Denver Post via Getty Images
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