For billions of years the greenhouse effect has made life possible on Earth. Build a terrarium—your own miniature greenhouse—to see this process at work.

This isn't the first time Earth's climate has changed, but it's the first time human activity has caused it. Learn more about global warming and how — and why — we should slow it.

Think your an expert on our changing climate? Test your knowledge with this interactive quiz.

What's better than watching ice melt? Building a computer model to simulate the melting! Ice flow plays an important role in everything from deep ocean circulation patterns to global warming.

At the poles, it's possible to study sea ice that's 3,000 years old. Find out what scientists learn by cutting up ice cores and seeing the ice crystals' many different textures and colors.

A year without a summer? Volcanic eruptions recorded in ice? Take a look at the world through the eyes of a geologist, and see the effects of climate changes.

Can you solve these four chilly puzzles about how people and animals live in the Arctic? Put your story telling skills to the test and collect new OLogy trading cards.

Life in the icy Arctic isn't so hard if you're prepared! Solve the puzzle of how people and polar bears live in a land of ice.

Travel to the edge of the Greenland Ice Sheet to find out what could happen if global warming melts it and the West Antarctic Ice Sheet.

Today, species are becoming extinct—disappearing from our planet—at a faster rate than ever before. What's behind this increase, and what can be done to slow or stop it?

How much can you reduce your carbon dioxide emissions? Is it worth it? Learn how simple choices multiplied by everyone in your community can make a big difference.

When it comes to global warming, your day-to-day actionscan make a big difference—if millions of people do it. Find out what you can do to save energy and slow climate change.

Surrounding Earth is a layer of air, the atmosphere, where conditions are always changing. Try your hand at predicting weather patterns by making a wind vane, a rain gauge, and a barometer.

What drives ocean circulation? How does the ocean's movement influence global climate? See firsthand how computer models are helping scientists answer these questions.

The ocean has a huge capacity to absorb carbon dioxide. To combat global warming, should we modify the ocean's chemistry to increase its uptake rates?

Ever wonder what causes ocean currents or how they circulate water and heat between the equator and the poles? Find out with a little food coloring and a hands-on look at convection.

It takes only about a month for any change in Antarctica's weather to be felt in North America—pretty remarkable when you consider that Antarctica is 12,874 kilometers (8,000 miles) away.

Talk about the force of gravity—Antarctica's powerful katabatic winds thunder down from the high polar plateau to the coast, creating wind speeds that typically exceed 100 mph every winter month.

The fickle Nordic sister of El Niño, the North Atlantic Oscillation regularly stirs up trouble in Europe, Canada, and the eastern US. Take an in-depth look at the little-known, yet significant, NAO.

Travel to the Peruvian Andes with a team of glaciologists, who are racing to observe the world's largest tropical ice cap—before global warming melts it away.

By taking biopsy-like samples from centuries-old Siberian pines, scientists have reconstructed a 300-year record of temperature changes for the Arctic and the Northern Hemisphere.

From weather experiments to North Pole travel to activities for "citizen scientists," these kid-friendly titles make it easy to explore weather and climate change.

Until recently there was 55 percent of Mercury's surface that we had never seen. NASA's January 2008 MESSENGER mission changed that, sending back a complete picture of Mercury and shedding light on its geological history.

When South Africa decided to build a new telescope, it went big—as in rival-the-world's-best big. Take a closer look at the biggest single optical infrared telescope in the Southern Hemisphere.

Continue exploring the ways human activity is changing our climate and what these changes mean for our planet with this collection of websites.