Megatsunamis are not only much larger than your average tsunami, they also form under different conditions. Good news: they're extremely rare. Bad news: they might not be for long.

A new report on climate change is pretty grim, but there is still a little hope.

For the people of Kiribati, climate change isn't something to be debated, denied or legislated against -- it's an everyday reality. The low-lying Pacific island nation may soon be underwater, thanks to rising sea levels. In a personal...

From problems with the moon, to the lumpiness of earth, sea levels aren't quite as exact as we have them figured out to be.

Earth’s outer shell is made of two materials whose different densities and thicknesses give rise to two distinct “levels” on the planet’s surface.



Watch our new show Paradigms (U.S....

The IPCC has released a special report assessing how the world’s ice and oceans are faring under our changing climate, and scientists may be one step closer to a cure for the common cold!

Rob Dunbar hunts for data on our climate from 12,000 years ago, finding clues inside ancient seabeds and corals and inside ice sheets. His work is vital in setting baselines for fixing our current climate -- and in tracking the rise of...

Hank sets the record straight on some of the findings of NASA's GRACE mission and how they relate to predictions about sea level rise and climate change.

Stefan and Alexis are headed to Olympic National Park in Washington state to bring you some of the coolest geology stories there. This week, they explore why Mount Olympus should be taller than Mount Everest.

Where rivers meet the ocean, coastlines tend to bend either inward or outward, creating estuaries and deltas. But how do they get those shapes? Want to learn more about the topic in this week's video? Here are some keywords/phrases to...

Dr. Steve Running discusses his work at NASA using satellites to keep tabs on Earth’s ecological systems. Jessi from Animal Wonders drops by to introduce Hank and Steve to Bindi the Bearded Dragon.

We've known about global warming for 50 years and done little about it, says Google.org director Larry Brilliant. In spite of this and other depressing trends, he's optimistic and tells us why. From Skoll World Forum, Oxford, UK,...

Humans take up a lot of space, but engineers are already coming up with some amazing solutions for the future.

So, what happens to normal stuff (like water) when it goes to not so normal places? What happens if you take a glass of water to the top of Mt. Everest? Or Space? In this episode of Crash Course Kids, Sabrina shows us how matter is...

Throughout Earth's history, climate has varied greatly. For hundreds of millions of years, the planet had no polar ice caps. Without this ice, the sea level was 70 meters higher. At the other extreme, about 700 million years ago, Earth...

An oblate spheroid is a special case of an ellipsoid where two of the semi-principal axes are the same size.

From gnocchi and salchipapas to potato chips and french fries, it seems like every cuisine around the world has embraced the potato! And this humble tuber did not originate in Ireland or France, but near Lake Titicaca near the border of...

Can a paper bag really help you when you are hyperventilating? It turns out that it can. In part 2 of our look at your respiratory system Hank explains how your blood cells exchange oxygen and CO2 to maintain homeostasis. We'll...

Every year, ocean levels rise and high tides flood the low-lying Marshall Islands in the Pacific, destroying homes, salinating water supplies and disrupting livelihoods. In a stirring poem and talk, youth climate warrior Selina Neirok...

In the 19th century, the California gold rush brought thousands of settlers to America's west coast. But finding gold may have been easier than transporting it back east. The only hope for avoiding a grueling six month wagon journey was...

If you teleported from sea level to the top of Mount Everest, things would go bad fast. At an altitude of 8,848 meters, you would likely suffocate in minutes. However, for people that make this journey over the course of a month, it's...

Today we're going to talk about rivers and how these dynamic, delicate, yet powerful systems are able to constantly change the landscape. We'll focus on the Zambezi River in Southeast Africa following its main features from the...

High elevations can be a problem for humans. Since the air is thinner, you get less oxygen with every breath, leading to all kinds of negative side effects. But there are millions of people around the world who spend their whole lives at...

When he learned of the threat that rising sea levels posed to his coastal hometown of Miami, Florida, eco-artist Xavier Cortada founded a movement around beautifully designed elevation markers highlighting the risk of flood damage. The...