unequivocal evidence that global warming is happening

There is no problem whether or not global warming is happening.
The most important is what is the reason and what should be done with this. And the IPCC statements are expression of hope, not of reality.

US delegation was cooperative and constructive

Why, on this topic in particular, do these words stand out? Is it because in the past, the opposite was true and the about face jumps out at you?

Or should we doubt the words, still!