
The melting of the Arctic ice cap is one of the most foreboding signs of dangerous climate change.
If too much ice melts, it will set off natural feedback loops that warm the planet even faster and disrupt weather patterns.
A month ago, satellite data from the US National Snow and Ice Data Center (NSIDC) suggested the Arctic sea ice was growing back. In early April, the ice cover was close to the 30-year average.
But in recent weeks, the NSIDC has recorded a rapid drop in ice cover. By late May, the ice cover had dropped below what it was in May 2007 — the lowest year on record.