Jeff Bezos, Amazon’s chief executive and the world’s richest man, said on Monday that he was committing $10 billion to address the climate crisis in a new initiative he called the Bezos Earth Fund.

The effort will fund scientists, activists and non-governmental organisations, he said in a post on Instagram. Bezos, who has been pushed by Amazon employees on climate issues, said he expected to start issuing grants this summer.

“Climate change is the biggest threat to our planet,” he wrote. “I want to work alongside others both to amplify known ways and to explore new ways of fighting the devastating impact of climate change on this planet we all share.”

Bezos has in the past done little philanthropy. With a net worth of $130 billion, he long preferred to focus on Amazon and other private ventures, such as Blue Origin, which makes rockets. Bezos also owns The Washington Post.

Bezos has ramped up his giving. His largest donation to date was $2 billion, unveiled in September 2018, to help homeless families and build a network of Montessori preschools, an effort that he announced with his then-wife, MacKenzie. After the couple divorced last year, she had signed the Giving Pledge.