Despite wars, disease and climate change, billionaire Microsoft co-founder Bill Gates says he's optimistic that humans' lives will continue to improve.

During the 25th anniversary celebration of the Gates Foundation, Bill Gates has announced that he was planning to give away "virtually all" of his wealth within the next 20 years. In all, he expects to distribute approximately $200 billion until the foundation shuts down on December 31,

Amid sweeping US foreign aid cuts, multibillionaire Bill Gates has said he will donate most of his wealth to meet urgent needs. He also slammed the role of fellow billionaire Elon Musk in ending critical aid programs.