Jellyfish float among the fronds of a kelp forest off Isla de los Estados, Argentina. Giant kelps (Macrocystis pyrifera) are the largest algae in the ocean, growing upward to more than 150 feet.

Five percent of the ocean is protected ... lent support to the creation of a protected marine park at the tip of Argentina. It’s next to waters that Chile designated as a park, and Sala believes ...