This story originally appeared on Grist and is part of the Climate Desk collaboration.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 tu...