Amazon's shipping costs are ballooning as it speeds up delivery.
The company reported Thursday that global shipping costs in the third quarter soared 46% over last year to $9.6 billion. This follows year-over-year cost growth of 36% in the second quarter and 21% in the first quarter.
In a statement on Thursday's earnings report, Amazon CEO Jeff Bezos highlighted the company's one-day delivery promise and suggested that speedier delivery is beneficial to the environment.
"Customers love the transition of Prime from two days to one day — they've already ordered billions of items with free one-day delivery this year," Bezos said. "It's a big investment, and it's the right long-term decision for customers. And although it's counterintuitive, the fastest delivery speeds generate the least carbon emissions because these products ship from fulfillment centers very close to the customer — it simply becomes impractical to use air or long ground routes."