Nature World: President Barack Obama will announce Tuesday plans to create what could be the world's largest marine sanctuary, an initiative that will protect large swaths of the Pacific Ocean from overfishing, energy exploration and other human activities, according to White House officials.
Slated to go into effect later this year after a comment period, the proposal could double the area of global ocean that is fully protected. Secretary of State John F. Kerry and White House counselor John D. Podesta led...