What will 4°C average global temperature mean for Planet Earth?

What will 4°C average global temperature mean for Planet Earth?

00   If no realistic agreement is made at the COP21 climate change conference in Paris, the world risks shooting past the safe 2ºC limit on its way to a 4ºC increase in average global temperature or more, but what will that mean for the planet?   A report produced by the Potsdam Institute for Climate Impact Research (PIK) and Climate Analytics for the World Bank in 2012 warned that such a temperature level would…

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