"Man is rapidly altering a balance that has developed over thousands of years"

You are forgetting one vital point in the conservation view. 
 
Species are fixed natural units that only alter (evolve), if at all, over very
long periods of time.

Subspecies, I prefer the wording "Present day local populations", are not fixed
units, they  are very fluid can easily be altered, merge into one another and
are a human, not a fixed natural unit.

Best regards
Roger White
Cyprus

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