There's a big difference between ruining a region and rendering everything on the planet extinct. Human activity depleting and permanently altering a local clim

There's a big difference between ruining a region and rendering everything on the planet extinct. Human activity depleting and permanently altering a local climate is well documented and known throughout history, but people move and survive. Nature is especially resilient and maybe with the exception of several thousand Megaton bombs glassing the planet (even then, plenty of microbes reside deep underground and might be radiation-resistant enough to handle it) life will find a way until Earth exits the habitable zone Even in the current changes we're seeing, many regions will become uninhabitable (I'm thinking India, for example) but currently Northern cold-climates are expected to become not only habitable but support agriculture (1). So yeah, we can destroy regions, but the planet lives on (1) https://www.frontiersin.org/articles/10.3389/fsufs.2021.663448/full https://www.frontiersin.org/articles/10.3389/fsufs.2021.6634...