The global High Seas Treaty, decades in the making, will become international law. It aims to create vast maritime conservation areas.

© Robert F. Bukaty/Associated Press

Most corals in the Atlantic Ocean will soon stop growing. Many are already dying, leaving shorelines and marine ecosystems vulnerable.

© Jason Gulley for The New York Times

The bumpy snailfish, discovered 10,000 feet down off the coast of California, shows that not all denizens of the abyss are frightening.