Whilst I agree with much of your post, as has already been pointed out, this bit is just daft. This planet will quite happily continue to exist and flourish despite our best efforts to cock it up.
The fact that mankind might well die out is an irrelevance to the planet. Other organisms more...
Agee completely, we’ve evolved to the point where our own actions will probably wipe mankind out. The planet will continue and other life forms will evolve to take advantage of what’s left.