Researchers say the Arctic Ocean crossed a biological tipping point in 2009, when nitrate levels in the water suddenly ...
The Arctic Ocean may have crossed a dangerous tipping point. Scientists say the rapid disappearance of sea ice is triggering ...
See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. The Arctic Ocean could see "ice-free" days within a matter of ...