7 OCTOBRE, 2018

Signatories to the Paris climate agreement — every country in the world, unless and until the US drops out in 2020 — agreed to what is by now a familiar goal: “holding the increase in the global average temperature to well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C.” 

How important is that difference, though? How much worse would 2 degrees be than 1.5? Is it worth the extra effort — and it would be a truly heroic effort — to limit temperature rise to that lower target?

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