Clodagh Kilcoyne/Reuters Jeff Bezos said he's giving $10 billion to fight climate change and launch a new initiative called the Bezos Earth Fund. "We can save Earth," he said in a post on Instagram. "It's going to take collective action from big companies, small companies, nation states, global organizations, and individuals." The richest man in the world, Bezos has an estimated net worth of about $130 billion, so his $10 billion pledge is about 7.7% of that. Visit Business Insider's homepage for more stories. Jeff Bezos said on Monday that he's giving $10 billion to fight climate change. The Amazon CEO and richest man in the world announced in a post on Instagram that he'd start the Bezos Earth Fund.