Colorado’s plan to expand its highway system could hinder the state’s green energy goals, according to a recent study.

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.

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