As the Arctic warms, thawing permafrost will release greenhouse gases faster and in greater amounts than previously believed.
Last year saw a significant hole open up for the first time in the ozone layer over the Arctic.
Arctic sea ice has reached its second-lowest level since satellite observations began over 30 years ago, scierntists at the University of Colorado Boulder's National Snow and Ice Data Center say.
If climate change continues, summer sea ice in the Arctic could disappear altogether - but in the meantime Arctic ice could temporarily stabilize or even increase.
Arctic sea ice concentration was at its second-lowest ever in March, according to data from NASA.
Ozone levels over the Arctic have been plummeting in recent days, and look to be heading for a record loss.
Climate change could have major implications for the US Navy, a report from the National Research Council has warned.
The water flowing from the North Atlantic into the Arctic Ocean is the warmest it's been in 2,000 years, say scientists.
The loss of Arctic sea ice could lead to species such as polar bears and some types of seal and whale being lost through hybridization.
The Arctic is contuing to warm at an unprecented rate - and the changes are likely to be permanent, says the National Oceanic and Atmospheric Administration (NOAA).
NASA's unmanned Global Hawk aircraft has successfully completed four science flights over the Pacific Ocean.
Activision studio Treyarch has announced that the next installment of the popular Call of Duty franchise will carry the name and rank of Black Ops when it is released on November 9.