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It is also very possible, perhaps even likely, that at some point we trigger 'positive feedback mechanisms'; vicious circles in which temperature change causes things to happen that in turn trigger more temperature change. This would be likely to provoke a step change in the climate that would probably be unstoppable by human activity. A recent and credible paper looked at five of these positive feedbacks and estimated that the trigger point for a step change could well occur at around 2 degC3