Climate Negotiators Confront a Key Question: How Hot Will the Planet Get?

As the second week gets under way, how is the Glasgow climate conference going? How is the planet faring? Is it on target for capping warming at 2.7 degrees C (4.9 degrees F) by later this century? Or are we headed for 2.2 degrees C or 1.8 degrees C? Or is it still a doomsday 4 degrees C (7.2 degrees F) or more? All those numbers have been in circulation in recent days. So what should we believe?

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