Quite the opposite. Society has been moving up hill this whole time, with downhill slides now and then. Climate change is possibly the worst slide, but the ones who make it the worst are dying off as their generation hits the end of their life expectancy. Gen Z and younger have very different priorities from the older generations. Millennials lean similarly, are building political power and hopefully fast enough to prevent the worst of Gen X from following in their predecessors' footsteps. Society isn't going to vanish just because sea levels rise. Society is near-global now, something that has never happened before; it is not comparable to some hunter-gatherer band that over-hunted their food supply.