This collaboration led by three major national aquariums - Monterey Bay Aquarium (MBAq), National Aquarium in Baltimore (NAIB), and New England Aquarium (NEAq) - is developing a leadership initiative to build capacity within aquariums and related informal science education institutions nation-wide, enabling education staff to engage and inspire millions of visitors to take action about climate change and the ocean. The project increases climate literacy among informal science educators by: 1) creating a national network for training, resource sharing and support; 2) developing climate change activity carts to support exhibit interpretation; 3) providing training for youth interpreters; and 4) hosting regional and national summits to strengthen collaboration and showcase and disseminate model programs. Outcomes for educators include increased knowledge of climate change science; knowledge of strategies, tools and materials for educating about climate change; and confidence in their ability to communicate about climate change.