The Rocky Mountain Institute (RMI), a Colorado-based green energy nonprofit, said in the study that expanding the state's roads could add as many as 70,000 cars per year to roadways. This could increase carbon emissions by 8 to 15 million tons per year by 2050, according to RMI. Coloradans would travel an additional 1 to 1.5 billion vehicle-miles per year, which would represent a 2% increase over current measures. âAs it stands, this project portfolio would negatively impact Coloradoâs greenhouse gas reduction goals,â the study concluded. In January, the Colorado Energy Office...