Global warming 'past the point of no return'?

The Independent reports on a record loss of sea ice in the Arctic this summer, and how this may mean a "tipping point" in the climate has been passed:

Scientists fear that the Arctic has now entered an irreversible phase of warming which will accelerate the loss of the polar sea ice that has helped to keep the climate stable for thousands of years.

They believe global warming is melting Arctic ice so rapidly that the region is beginning to absorb more heat from the sun, causing the ice to melt still further and so reinforcing a vicious cycle of melting and heating.

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