Warren Buffett is number one on Business Week's just-released ranking of American philanthropists. It will be featured in the issue of the magazine that goes on sale this coming Monday.
To compile its list of the Top 50 givers in the U.S., the magazine looks at what donors have contributed or pledged over the past five years.
Microsoft co-founder Bill Gates and his wife Melinda are number two with $2.625 billion.
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