I’m not depressed (at the moment, well maybe a little), just feeling philosophical.
Edit: the idea of this came to me because I was pondering why people fight so hard to beat diseases and live a few more years. What are they planning to do? Why exert effort just to be here longer when you don’t have a reason?
Just why?
It might be interesting to you that the total number of humans who have lived and died is about 110 billion. So in the last 100 years or so 10% of all humans who ever existed were born.
And regarding the warming for millions of years, I think we had multiple periods on earth with higher CO2 levels. No humans existed back then but life in general was quite fine. We are at about 400 ppm right now. https://en.m.wikipedia.org/wiki/Carbon_dioxide_in_the_atmosphere_of_Earth#/media/File:Phanerozoic_Carbon_Dioxide.png
Not to be too optimistic, we are heading for an unprecedented crisis. But reducing emissions matters because we are not going to go inevitably extinct.