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Warren Buffett is defending the philanthropic initiative he co-founded with Bill Gates almost 15 years ago as it faces what The New York Times calls a “billionaire backlash.”

Buffett wrote in an email to the newspaper, “I firmly believe in the Giving Pledge and consider it quite a success, though my physical limitations have eliminated my participation in the annual get-together.

“I have continued to contact possible members but only on a minor scale in recent years. Bill Gates has continued major efforts.”