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Running a temperature: The stakes of worldwide climate change have been laid out in their most uncertain terms yet, and it’s even worse than we thought. If greenhouse gases warm the atmosphere by as much as 1.5 degree Celsius, the worst consequences of climate change will be unleashed, according to a landmark report released Monday by the UN Intergovernmental Panel on Climate Change. To avoid this path, the world needs to slash emissions nearly in half by 2030 and go completely carbon neutral by 2050. That calls for unprecedented (and perhaps near-impossible) global action, from implementing carbon taxes to virtually ceasing coal burning.