Alexandra Cousteau embarked on her first ocean expedition when she was 4 months old. Today, the National Geographic Emerging Explorer and granddaughter of Jacques-Yves Cousteau devotes her energy to educating and motivating people to care about and protect Earth’s “Blue Legacy.” Ensia caught up with her in Washington, D.C.

This interview originally appeared in the Winter 2012 issue of Momentum magazine, Ensia’s predecessor, under the title “What Would It Take to Create Sustainable Ocean Fisheries?”