It is challenging to construct a realistic long-run scenario of a happy future that is sophisticated and meaningful. And at the global scale even the recent past sounds pretty horrific if you spell it out. The fact that the global situation is improving rapidly doesn't balance out the fact that being subjected to a 1950s standard of living would be potentially abusive today (no mobile, no connection to the internet, questionable access to goods, etc, better or worse depending on where you live).
Part of the trouble I have with climate change as an imminent emergency is there are actually quite a few civilisation-level threats at the 200-500 year timeframe. Resource depletion, progress in weapons research, fragility of logistic chains to disruption, disease. The actual impacts of climate tend to be contributing aggravations to what are honestly concerns more driven by overpopulation.