Not really. Evolution occurs fairly quickly. A few brown bears wander out onto the arctic tundra and evolve in order to survive into polar bears. Just like when hominids left Africa and evolved into Neanderthals to survive in Ice Age Eurasia. Or birds blown onto remote islands by storms.
If it took millions of years a species would not survive long enough to evolve.
Once again, someone is confusing a species already natural state to change for climate with some kind of "evolution."
That is not the evolutionary model, which depends on MUTATIONS.
And since biology proves that mutations are very rare, and positive mutations are still even more rare, it is science, not I, that refutes your claim.