Earlier quoted context omitted.
What? It's critical, so let's focus on practical responses to both limit future warming and handle the consequences of where we’re heading. A lot of people over-dramatise the situation, but we should be afraid to use words like "critical" when they make sense.
What I mean is the number isn’t critical. 1.9 degrees or 2.1 degrees aren’t substantially different, 2.0 degrees is an arbitrary milestone not a critical threshold. There is nothing particularly special about 2 with regards to outcomes.
There's nothing particularly special about any number, because by each 0.1 increase more species go extinct on average. We have to pick a point where we say "that's enough species gone", and 2 is bad enough. 1.9,1.8 etc is already critical imo