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That one is hard to say. We know that a large asteroid or comet or some catastrophic event happened to take out the dinosaurs in a relatively short period that would suggest a runaway climate change at that time. Scientists teach that our north and south poles have flipped hundreds of times over the life of Planet Earth and some speculate that we are overdue for that. When it happens it will provoke violent climate change for essentially all the Earth and won't be pleasant for the plants and creatures that inhabit the Earth at that time. Also in 2012, we narrowly escaped a direct hit from a massive violent solar storm. If the next one hits, will that change our climate? Scientists honestly don't know.
IMO opinion climate scientists should be focused on these kinds of things as well as inevitable and 'normal' climate change and figuring out ways humankind can best adapt to them. Putting all their emphasis on the relatively miniscule effect on climate of humans just living their lives is like spitting into the wind and accomplishes about as much good.
Why are you expecting the magnetic pole shift to destroy plant life?