If the world gets saved one small act at a time, the U.S. Postal Service and the Wildlife Conservation Society may be onto something. They've just unveiled a new stamp that aims to make protection of endangered species as easy as mailing a letter.

A word has entered the language -- at least, the language of environmental concern -- that may be ready for prime-time. That word is Anthropocene. It's the epoch we're apparently living in, roughly translated as the Age of Man.

As the Mississippi River crested at near-record levels near Memphis, Tennessee, a nagging question surfaced at a Capitol Hill briefing: are people to blame? One water expert suggests the answer is closer to yes than no.

If you took all the cows in the United States and figured out how much greenhouse gas they emit, would you be able to sue all the farmers who own them? Justice Antonin Scalia wondered about that in a major environmental case before the Supreme Court.

Senator John Kerry teed off on congressional Republicans and others who doubt the seriousness of the challenge of climate change.

Environment and climate scientist Lord Julian Hunt told Reuters in a video interview that although the situation at the Fukushima plant is an “extremely serious event,” there are risks to consider with every type of power.

A review of company and regulatory records shows that Japan and its largest utility repeatedly downplayed dangers and ignored warnings about its nuclear plants.

How green is the Amazon? Not as green as it used to be, an analysis of satellite images from last year shows.

I was given the assignment to not only photograph the event from Taipei, Taiwan, but to produce a multimedia video that showcased the world's landmarks without lights as part of the fifth annual Earth Hour.

Why would anyone in their right mind volunteer to spend a month to a month in a half in temperatures that usually don’t exceed -10 degrees Fahrenheit or -23 degrees Celsius? In the case of the roughly two dozen souls who work either for the British, Canadian and United States ...

The U.S. government has announced this as National Tsunami Awareness Week, starting just days after a disastrous tsunami powered over Japan's northeast coast. Not that anyone necessarily needed reminding.

Indonesian wildlife officials have arrested a suspected smuggler of critically endangered Sumatran tigers after a two-day stakeout, World Wildlife Fund reports. There are believed to be fewer than 400 of these rare big cats in the wild.

Scientists writing in the journal Nature warn that we could be on the brink of a mass extinction, the kind of species loss that has happened just five times in the last 540 million years.

Climate doesn't change by magic. Climate scientist Mark Serreze debunks what he calls "the Harry Potter theory of climate" and suggests an interesting idea about what made the last two U.S. winters so severe.

How many investigations of climate scientists' stolen e-mails does the world really need? The answer, in Washington at least, appears to be five. And counting.

Solar-powered water purification systems sold to Algeria, Malaysia: will they catch on?

Greenland's ice sheet melted at a record rate in 2010, and this could be a major contributor to sea level rise in coming decades.

With China’s subsidy of its renewable energy industry likely to be a continued topic of debate in 2011, a new report on the United States’ solar exports offers some insights into the domestic industry.