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The control mechanism of C02 atmospheric concentration is rather abrupt. C02 may accumulate in the atmosphere, increasing temperature and therefore evaporation and later rain. the rain leaches soil, sending large amounts of carbon to the sea. increased C03- ion leads to increased precipitation of calcium carbonate, efectively sequestrating carbon and eventually leading to an ice age.
the trick is on the different speeds of the fluxes composing the geochemical cycles.
since we had ice ages no so far [1,2], than the C02 concentration should not be above average.
Maybe Nomad can tell.
 - the configuration of the continents encircling the arctic must be responsible for switches between normal and ice ages, so these ice ages may unusual
 - is it possible that climate stability is much smaller than we have assumed. the rapid chances of recent past may be better known just because their clues have not yet been erased.
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