IT IS WIDELY accepted that it would be catastrophic if humanity’s greenhouse-gas emissions caused the Earth’s average temperature to rise more than 2°C above its pre-industrial level. As about a third of that temperature rise has already happened and another third is inevitable because of the time lag between the emissions going into the air and the warming they cause taking place, most people agree that large emissions reductions need to start now.

So the question for the world is how can we get national market economies, each of which is competing fiercely with all the others, to reduce their ...

 

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