The Jeremy and Hannelore Grantham Environmental Trust was formed in 2005 by Jeremy Grantham, Co-Founder and Chief Investment Strategist of Grantham, Mayo, Van Otterloo (GMO) and his wife Hannelore.

The Trust is a US 501(c)(3) public charity and a Type II 509(a)(2) supporting organization that supports charities whose mission is environmental protection, with particular focus on the developing world.

The Trust's endowment is approximately $250 million and its trustees are the CEOs of The Nature Conservancy, The World Wildlife Fund-US, Rocky Mountain Institute and Rare, in addition to Jeremy and Hannelore Grantham.