Amazon boss Jeff Bezos has pledged $10bn (£7.7bn) to help fight climate change, reports BBC.The world's richest man said the money would finance work by scientists, activists and other groups.
Writing on his Instagram account, Bezos said the fund would begin distributing money this summer.
Bezos has an estimated net worth of more than $130bn, so the pledge represents almost 8% of his fortune.
Compared to some multi-billionaires, Bezos had done only limited philanthropy. His biggest donation before Monday's pledge is thought to have been $2bn in September 2018 to help homeless families and fund schools.