Amazon is buying 1,800 electric delivery vans from Mercedes-Benz. The order with Mercedes is Amazon’s biggest with a European car maker. Daimler said the order is for 1,200 large eSprinter vans and 600 medium-sized eVito vehicles. Delivery will begin later this year.

Mercedes said it will join a climate initiative established by Amazon founder Jeff Bezos. By signing up to The Climate Pledge, Mercedes-Benz commits itself to going completely carbon neutral by 2039.

Referring to his own company’s efforts to cut emissions, Bezos has said that the addition of 1,800 electric delivery vehicles is another step in their journey to build the most sustainable transportation fleet in the world.