Richard Harris

Ever wondered who the big greenhouse-gas emitters are in your neck of the woods? The answer is now just a click away.

The US Environmental Protection Agency today unveiled a new website that identifies most of the nation's biggest emitters of carbon dioxide, methane and other greenhouse gases. It lets you, for example:

After a third sleepless night, climate negotiators in Durban South Africa finally found a way to reach a compromise early Sunday morning. The deal doesn't set hoped-for new targets to limit global warming, but delegates ultimately decided to embrace it rather than risk a major collapse of this international process.

United Nations climate talks, like many negotiations, are a blend of dead seriousness and theater. Today at the talks in Durban, South Africa, an American college student provided a moment of theater by shouting out a short, unauthorized speech during the main session of the talks. Her interruption encapsulated frustration with the pace of the talks in general, and the United States' role in particular.

Fundamental disagreements among the nations attending the U.N. climate conference in Durban, South Africa, may stall a possible deal.

As diplomats from around the world gather in Durban, South Africa, for talks about climate change, a big question looms: What will become of the Kyoto climate treaty, which was negotiated with much fanfare in 1997. The treaty was supposed to be a first step toward much more ambitious actions on climate change, but it is now on the brink of fading into irrelevance. That could have major implications for the future of United Nations climate talks.

A new round of United Nations climate talks is getting under way in Durban, South Africa, Monday. And domestic struggles here in the United States are hampering the global talks.

The United States is second only to China in emitting gases that cause global warming. Despite a presidential pledge to reduce emissions two years ago, we're spewing more carbon dioxide than ever into the atmosphere.

That's putting a crimp on the 20-year-long struggle to develop a meaningful climate treaty.

Brace yourself for more extreme weather. A group of more than 200 scientists convened by the United Nations says in a new report that climate change will bring more heat waves, more intense rainfall and more expensive natural disasters.

These conclusions are from the latest effort of the Intergovernmental Panel on Climate Change — a consensus statement from researchers around the world.

Cleaning up the air, while good for our lungs, could make global warming worse. That conclusion is underscored by a new study, which looks at the pollutants that go up smokestacks along with carbon dioxide.

These pollutants are called aerosols and they include soot as well as compounds of nitrogen and sulfur and other stuff into the air. Natalie Mahowald, a climate researcher at Cornell University, says so far, scientists have mostly tried to understand what those aerosols do while they're actually in the air.

The world would be a very different place if we could bottle up a bit of the sun here on Earth and tap that abundant and clean energy supply. Governments have spent many billions of dollars to develop that energy source, fusion energy, but it's still a distant dream. Now a few upstart companies are trying to do it on the cheap. And the ideas are credible enough to attract serious private investment.

This is the second of two reports on plans to export U.S. coal to China.

Coal producers in Wyoming and Montana are hoping new export terminals will be built in Washington state so they can ramp up their sales to China. Activists are trying to stop those ports, in part because they're concerned about global warming. But a thriving export market could also drive up the price of coal here in the United States, and that has climate implications as well.

This is the first of two reports on plans to export U.S. coal to China.

Plans are afoot to build giant new coal terminals on the West Coast to ship this lucrative commodity to China. But activists want to stop this, in part because coal produces huge amounts of carbon dioxide when it's burned. Federal climate policy is silent on this potentially large source of emissions, so the debate is happening at the local level.

Although dinosaurs died out 65 million years ago, there are still thought to be a few species left over from those days. Plants called cycads are among these rare "living fossils" — they have remained pretty much unchanged for more than 300 million years, but a study in Science magazine suggests that glamorous title may not be deserved.

There's no time machine in Washington, D.C., but Harvard botanist Sarah Mathews leads me to what's arguably the next best thing — a room made of glass in the U.S. Botanic Garden, just downhill from the U.S. Capitol.

If you or your mate shaved this morning with one of those thin-foil electric shavers, that face probably brushed up against a strange form of matter called a quasicrystal. Norelco is unlikely to get a Nobel Prize for that invention, but the man who discovered quasicrystals, Daniel Shechtman, will get this year's Nobel Prize in chemistry. And it didn't come easy.

Crystals, like diamonds and quartz, hold their sparkly allure because of the way the atoms inside those rocks line up so neatly.

A fundamental rule of nature is that nothing travels faster than the speed of light. Now, physicists working in Europe say they may have discovered a sub-atomic particle that breaks that speed limit. But that extraordinary claim is being greeted with a healthy dose of skepticism.

Ice on the Arctic Ocean has melted to its second-lowest level on record, according to researchers in Colorado who track this trend. The summertime melt coincides with a dramatic warming over the past decade, and it's already affecting wildlife in the Arctic Ocean.

The Arctic ice comes and goes with the seasons; typically about half of the wintertime ice melts away by mid-September. After that low-point, the ice regrows. In 2007, the amount of ice left in September hit a dramatic low.

David Keith is a bit fidgety. Maybe that's because venture capitalists have asked to come see his carbon dioxide machine. Maybe it's because the project is running months behind schedule, as experiments so often do. Maybe it's because his critics say it'll never work.

Or maybe it's a taste of excitement, because it seems entirely possible that the trailer-truck-size machine that he's leaning up against is actually going to work.

"It's amazing to see all this talk and paper get turned into hardware," he says. "I really love it."

A trillion is a huge number — when you're talking dollars or euros. But a trillion miles is not so much in the cosmic scheme of things. Astronomers say they've now found a planet that orbits two suns a mere thousand trillion miles from here. It's yet another example of a weird solar system being discovered around nearby stars.

Two years ago, NASA launched the Kepler observatory to look for Earth-like planets beyond our own solar system. It has found more than 1,000 apparent planets around distant suns.

The Arctic is heating up faster than anyplace on Earth. And as it heats, the ice is growing thinner and melting faster. Scientists say that sometime this century, the Arctic Ocean could be free of ice during the summers. And that transition is likely to be chaotic.

Arctic sea ice has always seen dramatic swings. Every winter, the ocean is completely covered with ice. It starts to melt in the late spring, and by September about half that ice has melted away.

If you glance around university corridors or scientific meetings, it's obvious that African-Americans are uncommon in the world of science. A study in Science magazine now finds that the black scientists who do start careers in medical research are at a big disadvantage when it comes to funding.

Human beings occasionally get diseases from animals, such as swine flu, rabies and anthrax. A new study finds that humans can also spread disease to wildlife, with grim results. A bacterium from our guts is now rampaging through coral reefs in the Caribbean.

Those reefs were already in slow decline, but they took a huge hit starting in 1996, when a disease called white pox appeared in the Florida Keys.

Micronesian islands have declared vast areas of the Pacific Ocean to be a sanctuary for sharks. It's the latest move in a trend to create zones where sharks can live undisturbed.

These top predators are in serious decline around the world because they are being over-fished. Mostly, they are caught to feed an insatiable appetite for shark-fin soup in Asia.

Dark, finger-like features that appear and extend down some Martian slopes during the warmest months of the year on Mars may show activity of salty water there. They fade in winter, then recur the next spring. The observations are tantalizing but tentative signs that Mars could have conditions necessary to support life.