Left turn

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Ok peoples lets try and figure this one out. In the episode Left Turn, Donna doesn't save the Dr and everything that happened AFTER he met her doesn't happen. If that really is the case, then wouldn't the Earth be the new home world for the fire people? I'm talking about the episode where the Dr and Donna go back to Pompia and stop those fire creatures by blowing up the volcano. I know it happened in the past but it was the Dr's future when he stopped it. Anyone one have any ideas on this? Also yes I know it's long over with but I'm rewatching the series today and love it and can't wait till the next season.