United Parcel Service Inc, along with rivals such as FedEx Corp and Deutsche Post AG unit DHL, faces pressure from regulators in major cities around the world to lessen the environmental impact of its fleet.

UPS has set a goal to have a quarter of the new vehicles it buys running on alternative fuels by 2020. UPS also aims to replace 40 percent of its ground transportation fuel with sources other than conventional gasoline and diesel.

“We strongly believe further investment in our natural gas fleet is a key element to help us achieve our long-term goals for reducing our CO2 emissions,” said Carlton Rose, president of global fleet maintenance and engineering for UPS.

This latest move will bring its investment in alternative fuel vehicles and related projects to more than $1bn over the last decade, Atlanta-based UPS said.

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