The Arctic Ocean, once locked in a vault of thick, old ice, now is transforming at lightspeed. Temperatures there are increasing at up to four times the rate of the planet overall, melting sea ice ...

Melting Arctic ice is revealing a hidden world of nitrogen-fixing bacteria beneath the surface. These microbes, not the usual cyanobacteria, enrich the ocean with nitrogen, fueling algae growth that ...

The Arctic landscape is changing at an unprecedented rate. In addition to rising temperatures, climate change is causing episodes of extreme melting, which occurs when ice losses that previously took ...

The Arctic is warming about four times faster than the rest of the globe, exposing natural resources, opening up potential shipping routes and prompting an increase in activity among military powers.