"Paris was a magnificent political achievement but it was woefully inadequate from the perspective of physics. And when it comes to a conflict between physics and politics, physics always wins."
Paris was, in fact, a perfect example of the kind of bribery, extortion and cynical bargaining the US and other parts of the elite’s global empire has engaged in since the beginning of well, everything.
More than 100 countries wanted 1.5°C as the goal of the conference, and Obama et al saw a way to get what they wanted. Our goal is to avoid climate catastrophe. Their goal is to appear to be avoiding climate catastrophe while not giving up any tiny bit of the wealth, power and privilege that comes with having a global empire and an increasingly unequal world. Getting an agreement was their goal—any agreement they could trumpet as historic and wonderful, regardless of whether it did anything to avoid utter catastrophe. Obama et al made a deal with the representatives of those 100+ countries—1.5°C over pre-industrial temperature would be included as the stated goal as long as the methods used to reduce greenhouse gases would have no chance at all of actually keeping warming under 1.5. (I’m sure it wasn’t stated that baldly.)
Although that’s still too high to be safe (as is obvious from the drastic effects we’re already seeing beginning to accelerate at barely 1°C, it’s virtually impossible to reach it now that there’s been an agreement that makes no attempt to, despite it being the nominal goal. The methods selected, and the fact that the first re-evaluation is 5 years from now, means that unless a global revolution forces governments to take more radical action there is absolutely no possibility of keeping warming under 1.5 and almost no chance of keeping it under 2. Higher than that leads to tipping points that may start runaway changes that cause more warming and make the world inhospitable to civilization. Unless you admire Machiavelli above all others, Paris was not a magnificent political achievement; it was a mass murder-suicide pact forced on the world by the rich.