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A comment on Long Before Trees Overtook the Land, Earth Was Covered by Giant Mushrooms (2013). Parent comment

Re:Long Before Trees Overtook the Land, Earth Was Covered by... by ascar on Wednesday April 26, 2023 @03:10PM (#35718535)
> The time scale for new species adapted to a completely new climate is many millions of years, not a few thousands.

On what are you basing this statement? I would argue that entirely depends on the complexity of the species and the time per generation. Bacteria certainly can adapt to extremely different conditions within years, if not even quicker. And these "simple life forms" are arguably much more important for the ecosystem than more complex ones like mammals.

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Re:Long Before Trees Overtook the Land, Earth Was Covered by... by melagonster on Thursday April 27, 2023 @01:06PM (#35731211)
if you only want bacteria, maybe. but even insects or spider still need more and more time to evolve closely new species. we even don't need to talk how many time for evolving a new mammal species. plants will extinct, too.
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