spendiQuote: How has evolution gone from the millions of years during which no species provided the slightest threat to the planet to a 200 year explosion of capacity in man which might be said to threaten the existence of all life when it is an obvious fact that evolutionary changes of even a minor order require long stretches, unimaginably long in Darwin's words, to work through.
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Thats not true, early bauplans of life included the cyanobacters , whose respiratory exudate was a toxic gas (wrt the planet at that time) Dirst thing after they established themselves it becameobvious that the entire atmosphere was becoming fouled with oxygen. Evolution is not a predictor of what will happen in years to come, it is, primarily, a system by which species
adapt, when adaptation is accomplished , some "weeding out" takes place at various time scales. Consider how feral goats and cats can totally change the ecosystems of islands after they are introduced(all within a few generations).
The fact that man is pan-terraforming animal whose technology and populational size has clearly demonstrated theFranklin/Malthusian observation of "Reproduction rates always outstrip the ability for the environment to support", which Darwin used in his own sysnthesis.
Ben Franklin observed that said "If we were to strip the world of all species except Fennel Plants and Englishmen, we would, in a few generations, be overwhelmed with Englishmen and Fennel Plants. Malthus copied that thinking and Darwin actually found ways to quantitate the results. We are, in a fashion, demonstrating the "Carrying capacity" of the ecosystem. The fact that we induce the changes is just the genius of this species.
Keep up the observation though, its good for you to walk outside the pub now and again.