Amazon is starting to roll out some of the electric delivery vans that it developed in partnership with Rivian, the companies announced Thursday. The vans will be deployed in a handful of cities to start, including Seattle, Baltimore, Chicago and Phoenix. The move marks a significant step forward in Amazon’s efforts to decarbonize its last-mile delivery fleet, an effort which began in 2019 when then-CEO Jeff Bezos announced the company would purchase 100,000 vans from Rivian.