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To: Maurice Winn who wrote (61814)	4/13/2005 1:21:20 AM
From: Snowshoe	Respond to of 74559

Wikipedia reports the following greenhouse gas percentage increases from 1750 to 1998... Carbon dioxide...31% Methane.............150% Nitrous oxide.......16% en.wikipedia.org

To: Maurice Winn who wrote (61814)	4/13/2005 10:48:31 AM
From: Moominoid	Read Replies (1) \| Respond to of 74559

It's 380 ppm now and was 270-280 ppm at the start of the industrial revolution. Therefore the increase in CO2 in the atmosphere is 30%. Methane has more than doubled. All this data is easily available anywhere include the Goddard Institute for Space Studies website or CDIAC. Atmospheric CO2 has only been measured since 1958. Early info is from ice cores etc. It has also been modeled way back for hundreds of millions of years - CO2 and temperature based on paleoclimate indicators. There was a lot of CO2 in the air in the Cretaceous and it was hot. Same in the Carboniferous. Two big cycles of CO2 and temperature and now as you say we are a very cold, low CO2 spell. Both have been trending down since the Cretaceous.