Ice in the Arctic Ocean melted to its second-lowest level on record this summer, triggered by global warming along with natural forces, say US scientists.
- The lowest recorded level of Arctic sea ice was 3.4 million square kilometres in 2012
- Temperatures for much of this year were 8 to 10 degrees Celsius above normal in the Siberian Arctic
- Warming of the Arctic and the melting of sea ice changes weather further south
The extent of ice-covered ocean at the North…