A California sea lion hunts for fish on a kelp paddy at Cortes Bank, a seamount off San Diego. It’s a trove of marine life that deserves protection, conservationists say. This photo originally published in “Why It’s Important to Save Our Seas’ Pristine Places.”
Every day, we publish online world-class photography from around the world. In honor of Earth Day, we asked our photo editors to pick their favorite images showcasing our planet's remarkable beauty and immense diversity—and the challlenges it faces.