Coral reefs are the nursery for all life in the oceans, a remarkable ecosystem that sustains us. Yet with carbon emissions warming the seas, a phenomenon called “coral bleaching”—a sign…

When National Geographic photographer James Balog asked, “How can one take a picture of climate change?” his attention was immediately drawn to ice. Soon he was asked to do a…

This documentary-drama hybrid explores the dangerous human impact of social networking, with tech experts sounding the alarm on their own creations.