Sam Brasch
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Evolving technology is making it possible to turn sewage wastewater into energy that can heat and cool large buildings. The largest such project in the U.S. is under construction in Denver.
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Residents of Colorado and neighboring states are digging out after one of the heaviest snowstorms on record. But it won't make more than a dent in alleviating the region's severe drought.
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The country's overgrown forests need to be aggressively thinned to reduce wildfire risk. That creates massive piles of worthless brush and branches, but some businesses see a new market for them.