The long tusk of the male narwhal earned these whales their fanciful nickname. But there's more to these Arctic mammals than their unique spiral tooth.
Emperor Penguins thrive in harsh conditions, but a new study shows that their fate depends on human action to slow global warming and associated loss of sea ice.
What if the nightly news had regular updates on forest clearing, ocean temperatures and fossil fuel consumption? These indicators sit alongside temperatures as signs of climate change.
Warm summers aren't the only threat to Arctic ice – increasingly intense winter storms are also weakening and reducing ice cover.
More than 600 experts will spend the next year drifting in Arctic waters to gain a better understanding of how climate change is affecting the region and how it can be fought.
Studies show that the Arctic is heating up twice as fast as the rest of the planet.
Coastal communities are helping scientists understand the impacts of marine heatwaves — and find solutions.
Algae at the bottom of the Arctic food chain relies on sea ice.
Polar bears 'invading' a Russian village have renewed concern over climate change in the Arctic, but human-wildlife conflicts are flaring up everywhere.
An atmospheric scientist explains why water can do some strange-looking things at very cold temperatures, and what's different about snowfalls on Mars.
Antarctic sea ice cover fell to an all-time low recently and hasn't yet recovered. Why? The initial answers could lie in an unlikely place – the tropics.
Climate change is shrinking Arctic sea ice and opening the region to ship traffic. Whales, seals and other marine mammals could be at risk unless nations adopt rules to protect them.
Since 2005, the Barents Sea has become too warm for sea ice to exist south of the Polar Front.
Since 1995, several ice shelves off the Antarctic Peninsula have abruptly disintegrated. A new analysis suggests that these events are triggered when ice shelves lose their buffer of floating ice.
Last summer one of Antarctica's floating ice shelves calved an iceberg the size of Delaware – but scientists say other less dramatic changes reveal more about how and why Antarctica is changing.
A new study shows that polar bears require more food than previously thought. The scientists used collars that tracked bears' movements and metabolic rates.
The link between melting sea ice and extreme weather has been known for a while, but now it's happening further afield.
The end of 2016 has brought balmy Arctic temperatures and record low ice extent for the time of year. It's a freak event even by modern standards, and climate models point the finger firmly at humans.
There is no doubt that 2016 has been a record-breaking year for the Earth’s climate.
Cold polar water can stop the Arctic sea ice from melting – but what happens if it warms up?