The link that Glenc has posted is very interesting. Especially the last graph showing CO2 levels in the atmosphere over last 450 00 years. The graph shows cyclic rise and fall of CO2 levels in approximately 100 000 years interval. According to this graph we are due to dramatic fall in concentration of CO2 in the atmosphere quite soon. I do not think that the have a Kyoto protocol 350 000 years ago.
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