Green light: What to expect after a deal that exceeded expectations

The actions outlined in the Paris pledges would be expected to lead to global warming of around 3°C. Given that there has already been about 1°C of warming, the measures required to stay below 1.5°C would be beyond heroic. Work by Joeri Rogelj and colleagues suggests that it would mean net emissions having to fall to zero in at most 40 years.