What we've done to the planet is perhaps less a consequence intelligence, more a consequence of multi-polar traps. Though it's in our collective self-interest to protect the planet, it's in our individual self interest to ignore the problem / prepare so that our own children can "weather the storm".
It kinda depends on how much you care about people across the world and future generations.
But yeah, if humans were more intelligent, we probably would have sorted all this out by coming up with better coordination mechanisms, and by overcoming our tribal tendencies more effectively.
But, if we were more intelligent, we might have raped the earth much faster and much harder too?
I see this too often, more intelligence = positive outcomes, but no, some of the smartest people ever put their intellect towards stupid causes, such as oil exploration and AI to capture peoples attention.
It kinda depends on how much you care about people across the world and future generations.
But yeah, if humans were more intelligent, we probably would have sorted all this out by coming up with better coordination mechanisms, and by overcoming our tribal tendencies more effectively.