Collapse of civilization (human society with huge amount of specialization) with the simultaneous ecological collapse can IMHO lead to human extinction. Civiliz

Collapse of civilization (human society with huge amount of specialization) with the simultaneous ecological collapse can IMHO lead to human extinction. Civilization gives us science and technology, which allows us to be, in theory, less dependent on nature. Conversely, if the civilization fails, we will have to rely much more on nature. If the nature undergoes mass extinction event when we strongly need to rely on it, we can easily get screwed. We can probably (as species) somewhat manage to handle one of these events, but not both at the same time.