The biggest threat to the planet is when the sun starts running out of hydrogen. (The biggest immediate threat to LIFE on Earth is people, but Earth would get on just fine without humans). 🌏<🌞
An expanding sun in about a billion years. Other than that probably nothing. For us, on the other hand, probably another 8-1/2 degree increase in global temperature should be the end of our existence.
Well, the point is, so were the ammonoids and the dinosaurs. Nature has discarded most of her designs, eventually; or, a species is like a TV show, and they all get canceled eventually.
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Of course the only correct answer is: ..... humanity.