For the past two years, the charismatic marine mammals have washed up on Pacific shores in record numbers. Scientists investigating the strandings suspect warming waters and melting sea ice are partly to blame.
Researchers are using snowdrifts to artificially warm Arctic tundra during winter and finding that more carbon is released from the soil than plants can soak up from the atmosphere.
Researchers discover a microbe living at -15°C, the coldest temperature ever reported for bacterial growth, giving hope to the search for life elsewhere in the cosmos.
New research adds to an emerging picture of the changes that global warming and thinning ice are wreaking on the marine ecosystems at the top of the world.