Threatened by climate change, pollution, overfishing, and oil spills, the world's oceans are suffering, scientists warned on Wednesday—the day designated by the United Nations as one to honor the deep blue sea.
From widespread coral bleaching to floundering fish species to garbage stretching across the water's surface and hundreds of feet down, it's clear that human activity is taking its toll on the world's oceans, which cover more than 70 percent of the Earth's surface.