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…

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

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

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…

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…

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…

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.

“I’m not ‘Ragweed Appleseed,’ I don’t go around planting ragweed. I’m just the messenger. The reality is I’m going to have more patients,” Dr. Jay Portnoy, an allergy specialist, said.

What happens when the airport scanner shows shapes that look like live spiders, snakes, lizards and tortoises inside three big suitcases?

It’s been one spate of severe winter weather after another since before 2011 began. That has given plenty of ammunition to climate skeptics who maintain that these cold snaps raise questions about…

The one word that leaped out of President Obama’s State of the Union address was — surprise! — “salmon.” It got a laugh for the Commander in Chief, but, this being Washington, it didn’t stop there.

The Chinese flags are disappearing from Washington’s wide avenues after China’s President Hu Jintao’s visit, but one statistic is still in the air: the size of the Chinese ecological footprint,…

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.

The latest chapter of panda diplomacy was written at the National Zoo, where the Chinese government agreed to lengthen the “loan” of popular panda pair Mei Xiang and Tian Tian for another five years….