TIME

First, the bad news: carpooling has been on the decline in America for nearly four decades. That practice could be helping the environment and America’s commuters, who are needlessly stuck for hours each day on packed highways. Multiple people sharing a single ride to a common destination is a simple act that has the potential to reduce CO2 emissions, ease traffic, lessen fossil fuel dependency, reduce stress on commuters, and even drive down rents in dense cities. Yet the practice fell out of favor after reaching a peak in the 1970s.

Now, the good news: popular tech companies Lyft and Uber are leading a wave of new services that have the potential to revive shared rides. “What fascinates me about these things is: can they move us closer toward a vision of an integrated public transit system?” asks Susan Shaheen, co-director of the Transportation Sustainability Research Center at the University…

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