Ocean expert Nancy Rabalais tracks the ominously named "dead zone" in the Gulf of Mexico -- where there isn't enough oxygen in the water to support life. The Gulf has the second largest dead zone in the world; on top of killing fish and crustaceans, it's also killing fisheries in these waters. Rabalais tells us about what's causing it -- and how we can reverse its harmful effects and restore one of America's natural treasures.

Nancy Rabalais: The "dead zone" of the Gulf of Mexico

The "dead zone" of the Gulf of Mexico

Agricultural practices, especially corn-soybean rotation, funnel harmful nutrients into the Gulf, tripling nitrogen since the 1950s.

Solutions include precision fertilizing and sustainable crops like perennial wheatgrass to reduce runoff and dead zones.

Nancy Rabalais unveils the alarming growth of 'dead zones' in the Gulf of Mexico, exacerbated by nitrogen-rich agricultural runoff.