Greg Mably for TIME

United Parcel Service took a detour to the right on its way to curb CO2 emissions. In 2004, UPS announced that its drivers would avoid making left turns. The time spent idling while waiting to turn against oncoming traffic burns fuel and costs millions each year. A software program maps a customized route for every driver to minimize lefts.

In metro New York, UPS has reduced CO2 emissions by 1,000 metric tons since January. Today 83% of UPS facilities are heading in the right direction; within two years, the policy will be adopted nationwide.

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