Former Secretary of State John Kerry, who is a Yale alumnus, served as the moderator of the event.
DiCaprio is an outspoken environmental activist and established his own foundation focused on conservation efforts in 1998. He also serves on the boards of World Wildlife Fund, Natural Resources Defense Council, National Geographic’s Pristine Seas, the funders’ collaborative Oceans 5, and International Fund for Animal Welfare.
In September 2014, the actor was designated as a United Nations Messenger of Peace.
The conference kicked off Monday at Yale University's Jackson Institute for Global Affairs.
DiCaprio closed out the conference on Tuesday by discussing citizen engagement and activism.