FORT COLLINS, Colo. — For the last few years, this northern Colorado city (population 160,000) has been reducing its greenhouse gas emissions and growing its businesses at the same time. Since 2005, its population has risen by 13.5 percent, but emissions have dropped by 14.7 percent. Last year’s drop, according to the city, was the equivalent of taking 71,000 passenger cars off the road.

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