Every few years, a Silicon Valley gig-economy company announces a “disruptive” innovation that looks a whole lot like a bus. Uber rolled out Smart Routes a decade ago, followed a short time later by the Lyft Shuttle of its biggest competitor. Even Elon Musk gave it a try in 2018 with the “urban loop system” that never quite materialized beyond the Vegas Strip. And does anyone remember Chariot?

Now it’s Uber’s turn again. The ride-hailing company recently announced Route Share, in which shuttles will travel dozens of fixed routes, with fixed stops, picking up passengers and dropping them off at fixed times. Amid the inevitable jokes about Silicon Valley once again discovering buses are serious questions about what this will mean for struggling transit systems, air quality, and congestion.

Five years ago, the Union of Concerned Scientists released a report that found ride-share services emit 69 percent mo

re planet-warming carbon dioxide and other pollutants than the trips they displace — largely because as many as 40 percent of the miles traveled by Uber and Lyft drivers are driven without a passenger, something called “deadheading.” That climate disadvantage decreases with pooled services like UberX Share — but it’s still not much greener than owning and driving a vehicle, the report noted, unless the car is electric.

Khosrowshahi insists Uber is “in competition with personal car ownership,” not public transportation. “Public transport is a teammate,” he told The Verge. But a study released last year by the University of California, Davis found that in three California cities, **over half of all ride-hailing trips didn’t replace personal cars, they replaced more sustainable modes of getting around, like walking, public transportation, and bicycling. **

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