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I should really read things before hitting the send button - the sentence below that ends abrubtly "one thing that's becoming clearer is that environmental fluctutaion in the past has not been" ... I meant to end, has not been as smooth as previously thought. What on a large timeframe appears as gentle undulations in temperature etc, on closer examination appear as rapid and sometime drammatic fluctutations in temp occuring over mere decades of time (with many different contributing factors from ocean currents to solar activity to airborne particles from volcanic activity etc).cheers,
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