That's easy: brains so smart that it eliminates all natural enemies causing an exponential population explosion. But not smart enough to overcome the challenges such an explosion must overcome
It's easy because it's exactly where we are now. Strip mining natural resources, runaway climate- and ecological change. And no way to solve it.
It's easy because it's exactly where we are now. Strip mining natural resources, runaway climate- and ecological change. And no way to solve it.