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Good points Wheresmy50, all valid but I'm not talking killing people on a short time scale, I'm referring to gradual and negative shifts in our way of life as a species.. A bollide impact would cause rapid extinction, climate changes on this scale would not.
Are you familiar with and do you believe the ice-core records from Greenland that span 800K yrs of history and climate change? The present is the key to the past, and the past is the key to the future... and if you really read the literature most of the time people might cite each other but good scientists always cite and disprove the other theories, and most papers I have read do just that.
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