Bill Gates and Warren Buffett have launched what may be the largest fundraising campaign ever conceived – $600-billion (U.S.).
The two billionaires have already pledged, or given away, most of their fortunes and now they are pushing other billionaires to donate at least half their wealth.
The campaign, called The Giving Pledge, “is an effort to address society’s most pressing problems by bringing more dollars to philanthropy,” Mr. Gates and Mr....