CITIES: Boulder, Colo., sets target to cut carbon emissions 80% by 2050 Published: Wednesday, July 31, 2013 Boulder, Colo., is adopting a new goal to decrease carbon emissions 80 percent by 2050. Please subscribe to ClimateWire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.