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Various types of solar panels are used at the 33-acre Arizona Public Service Solar Technology and Research Center in Tempe. An environmental group says energy-efficiency standards, clean car-requirements and initiatives supporting renewable energy are making a difference in Arizona. (Cronkite News Service Photo by Grayson Steinberg)

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Report: Energy efficiency, clean cars, renewables making a difference

Energy-efficiency requirements, rules on auto-emissions and policies promoting renewable energy helped Arizona prevent 3.5 million metric tons of carbon dioxide from entering the atmosphere in 2012, according to a report by an environmental group.