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In "After The Apocalypse," author Andrew Bacevich argues that the most important threats the U.S. faces are in North America, not on battlefields in the Middle East.

Americans are losing their starry views to light pollution. But some communities are make lighting decisions to help preserve night skies – while benefiting wildlife and human health.

Yvonne Aki-Sawyerr, the first female mayor in Freetown in years, is trying to clean up the perpetual mess caused by rain and garbage — a first step in her plan to revive the beleaguered city.

Plastic has become embedded in everyday life. That’s because for the last 70 years, the plastics industry convinced consumers to embrace the material for its low cost and disposability.

Despite improvements in air quality in past decades, 156 million Americans still breathe in too much soot or ozone, says the annual State of the Air report from the American Lung Association.

In the small town of Atchison, Kan., some unlikely investors are making a name for themselves as outspoken shareholder activists.

Without federal support, American communities will struggle to deal with a challenge as pervasive as climate change, market analysts and environmental advocates say.

New Zealand's unique birds are at risk of extinction, like the kiwi. So the country is trying to eradicate the invasive species that prey on them. Everyday people are lining up to help.

In the biggest tea-producing region of India, hazards range from red spider mites to wild elephants. One brave grower faces them head on, all while spurring a movement to grow tea organically.

Forty years ago, the U.S. nuclear industry suffered its worst nuclear accident. Today, the remaining reactor at Three Mile Island is slated to close because of cheaper competition from natural gas.