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Changing CO2 concentrations

ĄCO2 concentrations have varied naturally by a factor of 2 over the past few hundred thousand years

ĄFossil fuel burning since the industrial revolution has created a sharp increase in CO2 concentrations

ĄCO2 concentrations are now higher than at any time in past few hundred thousand years

ĄAnd concentrations are increasing faster with time

Last 4 Ice Age cycles:

400,000 years

See http://epa.gov/climatechange/science/recentac.html

Man made

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