Climate Central: Arctic sea ice appears to have reached its annual summer low point, and, as expected, it is the fourth lowest in the four decades of record-keeping, the National Snow and Ice Data Center in Boulder, Colo., announced Tuesday.
While summer ice melt is part of the normal seasonal sea ice cycle, the record lows reached in recent years are a clear sign of the warming-driven decline in Arctic sea ice. All 10 of the lowest sea ice extents on record have occurred since 2005.
The Northwest Passage of...