| Climate Surprise |
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Because of the high uncertainty regarding climate surprises, they are typically excluded from standard climate change scenarios. According to the International Climate Change Taskforce, the risks of surprises may increase above a 2°C temperature rise compared to the pre-industrial level, of which 0.8°C has already taken place and another 0.5 is already Committed . The 2°C rise is typically associated in Climate Model s with a Carbon Dioxide concentration of 400ppm; the current level is 379ppm, and rising at 2ppm annually. (The 2°C rise would not happen immediately, but would Effectively Be Inevitable .) Around 11,600 years ago, the earth's climate shifted from ice age to an age of warmth in the space of just 20 years. {Link without Title} EXTERNAL LINKS
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