more tipping points than a see saw

see_sawEarth may be approaching its points of no return. As Arctic sea ice hits a record low, focus is turning to climate ”tipping points” – a threshold that, once crossed, cannot be reversed and will create fundamental changes to other areas.

“It’s a trigger that leads to more warming at a regional level, but also leads to flow-on effects through other systems,” said Will Steffen, the chief adviser on global warming science to Australia’s Climate Commission. There are about 14 known “tipping elements”, according to a paper published by the US Proceedings of the National Academy of Sciences.
The Age (Australia), 23 Sep 2012