Meet the billionaires who pledged to give up their fortunes to change the world

Through the "Giving Pledge," men and women belonging to the upper crust of the society, with billions of dollars in their name, commit to donating a large chunk of their fortune, whether through their lifetime or through their will. Coming from the majority of their wealth, they are to be transferred in supporting the cause of making the world a better place. Among them are the founders, owners or CEOs of the world's most renowned companies.

span style="line-height: 15.8599996566772px;">MUNTINLUPA, PHILIPPINES (Catholic Online) - Bill and Melinda Gates are both co-founders of the Giving Pledge, encouraging the wealthiest people and families all over the globe to make a moral commitment in devoting at least half of their fortune to extend help to those who needed it, said the Daily Mail report.

The founder of Microsoft has made one of the largest single donations ever, committing to $10-billion in the development and distribution of vaccines. Together with his wife Melinda, the couple have invested $1.5-billion in their foundation.

The couple's close friend and Giving Pledge co-founder, Warren Buffet, made a public commitment of donating more than 99 percent of his fortune, either during his lifetime or his will. A $2.8-billion donation of his shares at Berkshire Hathaway cost him his lifetime of about $23-billion.

Tim Cook, Apple's current CEO, announced early this year his plan of donating his entire fortune, after paying for the college tuition of his 10-year-old nephew.

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PayPal co-founder, Elon Musk committed to sharing his vast wealth in helping develop projects he believes have social benefits, like the $250,000 donation for Japan's solar power system.

The former NYC mayor Michael Bloomberg was one of the first to commit to Giving Pledge in 2010, and Forbes reported that he has made donations that amounts to $3.8-billion for his lifetime.

Mark Zuckerberg of Facebook at 26 also made a commitment with Giving Pledge, leading the group of other young philanthropists. The second self-made billionaire woman and a known feminist, Sheryl Sandberg, also signed up last year.

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