You are missing the point Frank. There is protected land, not to be built on or disturbed in any way. These areas are small and very vulnerable. The most likely thing that can destroy them if not natural desaster, would be introduced species. Even if the higher form can not survive and take over, the life forms it harbors can do so i.e. its parasites.
Of course Southern California is loosing land rapidly, but there still is a reason to have concern and by no means are these native species already extinct. So to say, give up and who cares about introduced species is the naive perspective.

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