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Viiden vuorokauden sääennusteCopenhagen and Melbourne have committed to the most aggressive carbon reduction goals on the planet. Now those two cities _ homes to 4.5 million people _ have been joined by a perhaps unlikely companion on the fast track to carbon neutrality: the Colorado college town of Fort Collins, home to 150,000. This month, the city approved new targets to reduce emissions 80 percent by 2030 and become carbon neutral by 2050. Those goals place Fort Collins among a handful.