The remaining carbon budget for limiting warming to 2°C with 66% probability was estimated (in 2022) as equivalent to 23 years of (then) current CO2 emissions. It does not seem likely that we will be anywhere near zero CO2 emissions in 19 years. We are heading towards a hothouse Earth without the technology to reverse this on any meaningful scale. So no I don't think humans will be more happy, I think they will be hotter, more underwater and more hungry.
Side note: nobody else seems to have mentioned climate change yet in this thread. The fact that we are currently in the process of determining, through our CO2 emissions, what the medium to long term future of human society looks like seems...incredibly significant! And yet people don't seem to want to talk about it. Is it ignorance? Or resignation?