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The argument that "There have been climate changes before" does'nt hold a lot of water in our present scenario. Sure, there have been, but the major shifts took out a lot of competing species, witness the fossil record, and allowed mammals to flourish. The only reason we are here is because the climate during this period has been condusive to our development. Those shifts in our historical record have been minor and short lived.
Will the next change be so kind ? Probably not. We are adaptable, but can the planet adapt to 7.5 billion (9.5 billion at the going increase rate in about 30 years) of us, I think not to our advantage. Past time we cleaned up our act and started (perhaps thats returned) to living WITH the planet instead of trying to control and exploit it. We are only top of the heap now because of circumstances, this can change in very short order.
No, I do not advocate going back to living in caves and huts and growing vegies. Just to take what we have and use it with a bit more regard to the only world we inherited.
Bill
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