Tink, i do think some of the climate change is human-caused, and I also think we passed a "point of no return" some time ago...yes in a technical sense, the Earth is doomed.
However, that is not the end of the story because, you know how sometimes a hopeless cancer patient just proceeds to get well anyway, for some unexplainable reason?
I think that will happen, is happening for the Earth. Although technically doomed, the Earth will not die because so many people now are doing all they can to help. And somehow that is stronger than cause and effect...it's a different kind of power.
So the question remaining is, how much will the Earth recover? I think that is what we are working on now.
*** You come up with some fascinating articles, and I saved this one for reference also.