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Depends, all the human resources (Nuclear factories, normal factories etc.) Would still be on and would have nobody running them, animals in zoos wouldn't be fed, the plants and trees will die off because they have no carbon oxide (I think thats what humans breathe out.) Causing the animals to eventually die off. However it would take quite a while for all the plants to die.
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You're severely underestimating the size of the animal population, and that isn't how our ecosystem works at all. Species that actually depend on human life are very close to non-existent, and we are not even remotely relevant in the contribution to CO2 in our planet's atmosphere. Neither plants nor animals need us, and while there could be some disarray in ecosystems for a bit due to the sudden removal of the world's apex predator, at least every plant and animal species would be able to sleep well knowing that climate change and an approaching ice age aren't being tremendously accelerated. There's a reason our planet was flourishing for 6.3 billion years before the Industrial Revolution.