How long would life on Earth survive without any animals?
In my story, all the fauna in the planet (basically Earth) has been instantly killed, leaving only flora and fungi. How long will it take before the effects start to show, and how long until all the CO2 disappears, (which would freeze up the planet)?
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If all the fauna on earth has been killed (vertebrates and invertebrates), there are no pollinators left. Which would kill off many plants. (That is, make them unable to reproduce, so once they die, there won't be any more of them.) The plants that are wind-pollinated will survive.
There will still be CO2: from fungi, from zooplankton. Plants also produce CO2. The earth would survive indefinitely. New species will evolve to fill up the emptied ecological niches.
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