Walmart heir Rob Walton and his wife are financially backing an environmental project founded by the heir to another empire.
The Rob & Melani Walton Foundation have joined an elite group of philanthropists funding the Earthshot Prize, an initiative of Britain's Prince William. British news outlets report the Waltons were not on the list as recently as March.
Earthshot will give five awards of about $1.4 million each year through 2030 to people, projects and organizations working to solve global environmental challenges.
Rob Walton, a son of Walmart Inc. founder Sam Walton, is worth $64.2 billion, according to Forbes. Earthshot's website does not list the amounts donated by its seven Global Alliance Founding Partners.
The alliance's other members include Aga Khan Development Network; Bloomberg Philanthropies; and the Jack Ma Foundation.
Walton, a longtime supporter of environmental causes, serves on the board of directors of the nonprofit Conservation International. He is also on the Walton Family Foundation's Environment Program Committee.