Of what benefit are they to the natural world? How does that make this world a more verdant and biologically diverse planet?
Considering the huge negatives humanity has already bestowed upon the natural world? What possible use is humanity?
Humans are not needed by any life form. Worms matter, Cod matter, Ravens matter...they all have a place in the web of life, the food chains.
Humans are simply top tier consumers. They do not benefit the world in life or death. They are entirely expendable to the planetary ecosystem. Nothing would miss them or depends on them, no food chains would be disaffected. Apart from that of domesticated species, maybe. If all humans died tomorrow, all that would happen is that the natural order would recover and biodiversity loss would cease and the wild begin to regenerate. The 6th mass extinction would come to an abrupt end.
I don't mean to be nasty. I am not trying to be edgy, and I am not [Completely] insane. I am sorry humanity. You're just not what we're looking for. Speaking on behalf of the mute...
Probably time to post this then, even if it was about WW1 to come than what we might face:
There Will Come Soft Rains by Sara Teasdale
There will come soft rains and the smell of the ground,
And swallows circling with their shimmering sound;
And frogs in the pools singing at night,
And wild plum-trees in tremulous white;
Robins will wear their feathery fire
Whistling their whims on a low fence-wire;
And not one will know of the war, not one
Will care at last when it is done.
Not one would mind, neither bird nor tree
If mankind perished utterly;
And Spring herself, when she woke at dawn,
Would scarcely know that we were gone.
And I am a bit pessimistic too, as to our abilities so as to survive as a species - given we seem to have a tendency to vote (for those who have such luxuries) for those who represent what we might individually want over what might be good for us all, and the tendencies of those relying on this to get into power (and often for their own benefit than ours). This besides all the divisions that tend to ensure we will never probably become a species of note but merely a prototype for such.