Search Results for: Polar Bears
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581 results
- Planetary Science
Readers contemplate water on Mars and more
Readers had questions about the significance of finding water on mars, air pollution from wildfires and spray-on sensors.
- Climate
What happens when the Bering Sea’s ice disappears?
Record-low sea ice in 2018 sent ripples through the Bering Sea’s entire ecosystem. Will this be the region’s new normal?
- Planetary Science
5 things we’ve learned about Saturn since Cassini died
The Cassini spacecraft plunged to its death into Saturn six months ago, but the discoveries keep coming.
- Planetary Science
Two daring spacecraft aim to bring asteroid dust back to Earth
A pair of daredevil spacecraft that aim to bring asteroid dust back to Earth have reached their targets and are scouting for the best sampling spots.
- Ecosystems
Beavers are engineering a new Alaskan tundra
Climate change has enabled the recent expansion of beavers into northwestern Alaska, a trend that could have major ecological consequences for the region in the coming decades.
- Animals
Pandas have ultrasonic hearing
Giant pandas hear very high frequencies. Scientists still don’t know why.
- Climate
Arctic sea ice shrinks to second-lowest low on record
A warm summer helped shrink sea ice in the Arctic Ocean to a statistical tie with 2007 for the second smallest sea ice minimum on record.
- Climate
Year in review: Sea ice loss will shake up ecosystems
Researchers are studying the complex biological consequences of polar melting and opening Arctic passageways.
- Animals
Polar bears’ ‘walking hibernation’ not much of an energy saver
Summer’s “walking hibernation” doesn’t shut down polar bears as much as winter does.
- Oceans
Sea ice algae drive the Arctic food web
Even organisms that don’t depend on sea ice depend on sea ice algae, a new study finds. But Arctic sea ice is disappearing.
- Animals
Microbes may help bears stay healthy when fat for hibernation
Brown bears fatten up for hibernation without suffering from weight-related problems. A new study shows that their gut microbes may help.
- Climate
Human CO2 emissions put Arctic on track to be ice-free by 2050
Sea ice is shrinking by about three square meters for each metric ton of carbon dioxide emitted, new research suggests.
