The Chronicle of Philanthropy has released its annual list of America's biggest donors of 2012. Take a look at the 15 most generous donors.
1. Warren Buffett. Donations: $3.1 billion. Buffett is chairman of the investment firm Berkshire Hathaway. Most of his donations have gone to the Howard G. Buffett Foundation, NoVo Foundation and Sherwood Foundation.
John F. Martin/General Motors
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