The soot that covers statues and buildings makes even more smog, eventually hitting our lungs.

Air pollutants are linked with heart disease, lung disease and other serious afflictions that have long-term impacts.

A new study says commuting to work by car may be far more harmful to your health than previously believed.

China's most polluted cities have made strides in reducing air pollution, but there's still work to be done.

This is what London's air would look like without cars.

The air inside your home can be more polluted than the air outside. Want cleaner air? Here are 11 natural ways to clean your indoor air without using chemicals.

Falling levels of air pollution have resulted in a drop in California's dense tule fog.

Some of these massive beasts are familiar in form but enormous in size, while others are strange hybrids of modern-day animals.

At least five similar die-offs have happened before, but this is the first in human history — and the first with human help.

Researchers study the genetic secrets of the world's last Pinta Island tortoise.

If humans are still around millions or billions of years from now, they'll have to deal with supervolcanoes, asteroids and worse.

Become a fan and win these 5 environmentally-themed books.

The oddball asteroid Lutetia is a rocky remnant of the material that formed Earth, Venus and Mercury about 4.5 billion years ago, a new study suggests.

This is a great week for planetary observers. Mercury is in its best position as a "morning star" for observers in the Northern Hemisphere while Jupiter is at i

By analyzing ear wax from a deceased blue whale, scientists gained clues to years of chemical exposure.

Test your knowledge of the wild world of animal mating.

From what they eat to wear they live, test your giant panda knowledge with this quiz.

Crows and ravens are some of the smartest animals on the planet. So what do you know about them?

What do you know about your kidneys? They don't get the acclaim of the brain or the heart, but these small organs work nonstop to keep your body healthy.

Let's see how well you know your own species' family tree.

Test your knowledge about frogs and toads with this quiz.

You go to the beach to relax and soak up the sun. But how much do you really know about the waves and the sand?

How much do you know about these ancient shelled reptiles?

Want to delve inside someone's subconscious? Graphology might hold a key.

Before you scoop up your next bowl of ice cream, test your knowledge about everyone's favorite summer treat.

They help you see the world, but how much do you really know about the windows to your soul? Test your knowledge.

Can you live without your morning coffee or afternoon soda? See how savvy you are about your daily buzz.

When your head hits the pillow at night, do creatures lurk? See how much your know about terrifying dreams.

There's a whole medicine chest in the garden. Do you know which plants to use for what ailments? Test your holistic herb wits here.

How much do you really know about the ground under your feet? Test your knowledge with this quiz.

These iconic pink birds are immediately recognizable, but how much do you know about them? Test your knowledge of these beautiful birds!

Life across the globe depends on bees, butterflies, birds, bats and other pollinators. Test your knowledge about these vital creatures.

From spring showers to summer thunderstorms, rain can fall any time of year. But how does it work?

Bison have been named our new national mammal. Test your knowledge of this species that's so critical to North America's ecology.

These unusual creatures are stunningly beautiful and surprisingly important to life on Earth. Show us what you know!

Sheep provide us with meat, clothing and even scientific illumination, but how much do you know about them? Find out with this quiz.

Test your knowledge of all things autumnal.

A lot of faulty survival information gets passed around. Can you sort out which actions will save you, and which might kill you?

Bacteria live everywhere in your body, including your gut. These microbes have quite an impact on your health. Do you know what they do?

Whether it's a white lie or a whopper, fibs are part of our daily lives. We like to think we're honest but, well, we're not. Test your falsehood expertise.

Whether you're crying tears of joy or crying over spilled milk, how much do you really know about the tears rolling down your face?

Lightning is more than just a stunning spectacle. Take our quiz to see how much you really know about this electrifying natural wonder.

Think you know everything about that special day of scary movies and sugar highs? Test your Halloween smarts ... if you dare.

It's time for some healthy change. Here are some fundamental truths you need to know about diet, exercise and other wellness goals.

When the going gets tough, some animals get going — to bed. Take our hibernation quiz to see how much you know.

Former Carter advisor and energy guru S. David Freeman will become the 'environmental mayor' of L.A.

The Sustainable Energy Coalition lists 7 facts about the growing green jobs sector.

The veteran anchorman and <i>60 Minutes</i> host hosted me and frequent sparring partner Matt DeBord (car blogger for <i>Slate</i>) on his HDNet program. And th

A dramatic film explores the physical and emotional challenges of living in a peak oil scenario.

Rich natural gas deposits off the shore of Israel can meet the country's energy needs well into the next century, provided it can be extracted economically.