Assuming all of that is accurate, it does not require high technology to measure the temperature and since everyone would do it given the chance it is certainly reasonable assumption. That means temperature is up 0.4%
Notice how they don't say that, instead they say 1.2 degrees and many will assume the same thing. This is a big deal because the different systems on earth are elastic. The idea that the earth can handle a 0.4% increase is very reasonable.
Second, from human standpoint 150 years is about 2% of human recorded history. So you have a small sample size.
There is no reason to assume that the starting temperature should be considered an ideal temperature for the earth. Why? Was the Ice age a more ideal temperature? I don't think so. Therefore the earth warming up after the ice age is not a bad thing and it certainly has. But the truth is I don't know.
What I do know is they are very deceitful in the way they present the science.
1. The carbon cycle is a cycle. The carbon in the atmosphere acts as fertilizer helping plants grow.
2. It is possible that the extra carbon is having harmful impacts on certain creatures in the sea.
3. But it is also very possible that the extra carbon is sequestered as methane hydrates at the bottom of the ocean.
But the whopper of a lie that they tell people is that we have to stop burning "fossil fuel". It isn't fossil fuel. It isn't cooked dinosaurs, or ancient algae. The methane hydrates at the sea floor are on a conveyor belt known as plate tectonics and they are what is cooked and turned into petroleum. Wells that were essentially dry and plugged were discovered to be refilled twenty years later. We are not burning fossil fuel, we are burning recycled carbon.
Finally the obvious and very clear solution to all this is not to waste trillions of dollars on the Green new deal. This last week China operated a Fusion reactor for 17 minutes. With AI and quantum computers it is very reasonable that we will have working fusion reactors in no time. So instead of wasting our resources on nutty waitress schemes and Hollywood elites, why not focus on a real solution.