How to use the ocean without using it up

Since 1950, humans have killed off more than half of the world's tunas and sharks, and we're on track to have more plastic than fish in the ocean by 2050. Dr. Ayana Elizabeth Johnson, a marine biologist and policy expert, advocates zoning the ocean as we do land, applying a triage approach, and working with coastal communities, so we can stop—and in some cases, reverse—the alarming destruction of the ecosystem.