When filmmaker Ian Cheney moves to New York City and discovers skies almost completely devoid of stars, a simple question – what do we lose, when we lose the night? – spawns a journey to America's brightest and darkest corners. Astronomers, cancer researchers, ecologists and philosophers provide glimpses of what is lost in the glare of...

In the far North, in the late fall, at a time of year when it should be covered with ice, the sea remains frozen along the coast of Greenland. Glaciers are melting and shedding chunks of ice that are scattered across the ocean surface. The animals inhabiting the land and water are threatened by warming temperatures and loss of sea ice....

An exploration of built and natural environments along the 800-mile length of the Trans-Alaska Pipeline.

Every km of ocean now contains an average of 74,000 pieces of plastic. A 'plastic soup' of waste, killing hundreds of thousands of animals every year and leaching chemicals slowly up the food chain. In Holland, scientists found plastic in the stomachs of 95% of all fulmar birds. In Germany, plastic has been found to affect the reproduc...

When the graves of former slaves are bulldozed in Mississippi, a native son returns to protect the community they settled - a place now threatened by urban sprawl, hurricanes and an unprecedented man-made disaster.