TJ I largely agree with you, humanity faces huge challenges. I think the push back you’re getting is the assertion that billions will die. That’s your opinion not fact. I personally disagree, humans have a great many flaws and are pretty terrible at forward thinking but when our backs are against the wall we can do amazing things.
I’m sure that in the 1930’s as the nazi war machine rampaged across europe things looked pretty hopeless but people fought on, persevered and things improved.
As the plague ripped through Europe things must have looked completely hopeless but humanity marched on.
Take your pick of any of the many disasters that have faced us and we persevere. The general trend is upwards.
To the OP I don’t think we’ve hit peak humanity, not even close.