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2 °C or not 2 °C? That is the climate question / Tim Lenton. Nature 473,         7          (2011), Published online 4 May 2011 (column : World Wiew)http://www.nature.com/news/2011/110504/full/473007a.htmlTargets to limit the global temperature rise won't prevent climate  disruption. Tim Lenton says that policy-makers should focus on regional  impacts...