Today, Amazon CEO Jeff Bezos announced that he would be committing $10 billion to fight climate change through a new fund called the Bezos Earth Fund.

He announced new fund in a post on Instagram. Amazon confirmed the existence of the fund to The Verge:

Bezos said that the money will be used to help scientists, activists, NGOs, and “any effort that offers a real possibility” to help preserve the earth from the impact of climate change. A person close to the fund told The Verge that it would not engage in private sector investment, but focus entirely on charitable giving.

The fund plans to begin issuing grants this summer, but right now, there are few hard details besides what Bezos shared on Instagram, so it’s unclear exactly how or when applications for grants will be accepted.

Bezos is worth about $130 billion, so committing $10 billion to philanthropy isn’t taking a huge chunk out of Bezos’ net worth. Bezos hasn’t been quite as vocal as other tech billionaires about his philanthropy, though in 2018, he did launch announce a network of free nonprofit preschools to be built in low-income communities. And in 2017, he polled Twitter for philanthropy ideas that could assist people in need in the near-term.

Update 2:26PM ET: Updated with more information from a person close to the fund.