As some who doesn't know much about dinosaurs I always assumed pterosaurs are ancestors of birds and not theropods. Interesting to learn theropods were the ancestors.
As far as I understand implemented policies refers to policies that are currently taking effect (comparable to policies and actions in climateactointracker prediction, the difference between the numbers is probably due to difference in modeling). Lots of NDCs and targets are to be implemented later and there are economic and political intensives to implement them at least to some degree. That's where 2C comes from.
I see multiple people in this thread are talking about 3 degrees which is unrealistic. While 1.5 seems unlikely at this point 2 degrees is within reach and IMO the most likely outcome. I would even say anything above 2.5 is unrealistic. This chart[1] can be useful, compare it to last predictions and you'll see the reason of my optimism.
Also note in the beginning of 2010s solar was very expensive, right now it's (almost) the cheapest source of energy[2] and the technological problem at this point is battery.
That begin said our problem for switching to renewables isn't only technological, there are political reasons (e.g. China and coal [3]) and also despite solar being cheap for a certain period of time running old infrastructure (e.g. natural gas power plant) still makes economic sense, at least in the short term. but I expect that predictions like [1] become more optimistic in this decade.
As a final note in the past economic growth = more pollution which is simply not the case any more for most of the countries.