Imagine a world in which the ocean is teeming with life and vibrant with color. That is the world that Dr. Sylvia Earle first saw in 1979  as the only human ever to dive untethered to a depth of over half a mile. Having witnessed so much loss in the world’s waters since then, National Geographic Explorer Earle offers deep insight about what we can do to protect and restore nature’s bounty during her interview on On Leading.