Well, I believe that the answer to your question is yes, the Earth is most certainly doomed. However, as to when/how, those are all up in the air. I would imagine that it will eventually be due to nuclear (or the next new, deadler, bigger, WMD) war, but overpopulation probably will certainly be a concern in the future.
Hopefully, if we manage to beat the odds and survive until the sun does engulf the earth, we'll have managed to inhabit other planets by then.
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