I see your point. If we make technological improvements that reduce consumption, Earth can sustain more people. If those improvements increase consumption we sustain fewer.

As I said increasing technology and life comforts genrally reduce population growth, let's hope for other technology miracles as well. This is a reasonable position. I spent the weekend in the Pennsylvania wilderness in an area that in the mid-1800s had been stripped bare by logging and was now a preserved and expansive wilderness. Humanity can and will adapt. Believing so helps me sleep at night.

I'm hopeful as well. I believe that humanity will definitely suffer from climate change to an extent, at least in this century, but eventually will figure out sustainable energy and thus not go extinct.