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I am not at all certain that it is not already too late to have any substantial healing effect on our environment. All things taken into account we have not really progressed far from the cliffs and caves from which we emerged over a quarter of a million years ago. Taken collectively we are as heedless now as ever. The notion that humans will survive and remain here in perpetuity is a purely theological notion and by no means scientific. Species come and species go. Perhaps our time is approaching.