Actually we are very inflexible. That’s why we adapt environments to our own needs. We really haven’t been around long enough to know if we can truly survive a fundamental shift in the environment that we can’t control.
That's my opinion too. The Sahara used to be a rich tropical forest, non-avian dinosaurs used to roam the Earth, we used to have one big continent, and all of this has changed. We're not meant to last, but the Earth is. And eventually, a few billion years from now, it will disappear too.
We're pretty adaptable ourselves