The Case of Missing Carbon: Hooked on fossil fuels, humans pump carbon dioxide into the atmosphere. Fortunately, plants and ocean water gather it in. But what happen when the planet’s great carbon recycling system goes awry?

Rio’s Backyard Rain Forest. The once vast Atlantic forest of Brazil survives only as a scattering of green islands in a sea of human sprawl. Now scientists have plans to save its remnants from the rising tide of development

Harp Seals. Wolves of the sea to fishermen and cause célèbre for anti-fur activists, the irresistible animals are raising tempers again