Arctic sea ice melt at record level
More sea ice has melted in the Arctic this summer than at any time since satellite records began more than 30 years ago, scientists say.
It is thought a natural warming and cooling cycle could be responsible for up to 30% of the melting - but the rest is the result of human activity releasing greenhouse gases.
Roger Harrabin reports.
27 Aug 2012
- From the section Science & Environment