If shellfish populations collapse, the animals that eat them will also suffer, with ripple effects throughout the ocean's food web. Two important planetary ecosystems, coral reefs and polar regions, ...

Some animals now live in a world of plastics—like these hyenas scavenging at a landfill in Harar, Ethiopia. They listen for garbage trucks and find much of their food in trash. PHOTOGRAPH BY ...

Billions of pounds of plastic can be found in swirling convergences that make up about 40 percent of the world's ocean surfaces. At current rates plastic is expected to outweigh all the fish in the ...