

I thought the California redwoods proved it was a different thing limiting height. They get water from the air because of how humid it is and therefore grow taller because their main limitation was the ability to move water from their roots to the rest of the tree.




Honestly given that we are a very intelligent generalist, I think it would be very hard to completely eradicate humans.
But I would agree that we could have a crazy bad collapse and have to start way over due to a much smaller habitable part of the planet and maybe that habitable area shifts around making us nomadic or something. That would probably make it a lot harder to redevelop tech. Source: https://www.open.edu/openlearn/nature-environment/environment-understanding-atmospheric-and-ocean-flows/content-section-4