Venus is an extreme example of an Earth-like planet with a very different climate. There is nothing in physics or chemistry that says Earth’s temperature could not one day exceed 100 C.
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[Regarding ice melting -- ] That will take time, but very little time on a cosmic scale, maybe a couple of thousand years.
I’ll be blunt, remarks like these undermine your credibility. But regardless, I just don’t have any experience or contributions to make on climate change, other than re-emphasizing my general impression that, as a person who cares a lot about existential risk and has talked to various other people who also care a lot about existential risk, there seems to be very strong scientific evidence suggesting that extinction is unlikely.
I definitely think beware is too strong. I would recommend “discount” or “be skeptical” or something similar.