Actually I recall reading a comment from the show's creator Rick Berman. He was responding to some criticism about events in the Enterprise show that didn't match up with past Star Trek series. He basically stated or gave the impression that with the Generations crew going back in time, a differernt timeline has been put in place. Basically, it sounded like he was giving himself creative license to make some changes if he so desired. Just an FYI although I do agree with you that, any fan knows, the Earth isn't going to be destroyed so a great deal of suspension of disbelief is required.