One of Canada's Arctic ice shelves has virtually vanished, and several others have diminished significantly over the summer.

Newly discovered ancient, mummified trees may reveal clues about future ecosystem responses to climate change.

The northernmost mummified forest ever found in Canada is revealing how plants struggled to endure a long-ago global cooling.

A new study of the High Arctic climate roughly 50 million years ago led by the University of Colorado at Boulder helps to explain how ancient alligators and giant tortoises were able to thrive on Ellesmere Island well above the Arctic Circle, even as they endured six months of darkness each year.

A new study shows the Arctic climate system may be more sensitive to greenhouse warming than previously thought, and that current levels of Earth's atmospheric carbon dioxide may be high enough to bring about significant, irreversible shifts in Arctic ecosystems.