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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