South Asian monsoons, the Amazon rain forest and polar sea ice -- all significant environmental systems that control and regulate the climate of the entire planet -- could each serve as the site of an environmental tipping point as global temperatures rise, according to this article. Scientists are unable to predict the consequences of tipping-element changes to the Bodélé Depression in Chad or the Gulf Stream in the Atlantic Ocean, though changes to these systems have already been recorded. Wired.com/Wired Science blog
