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[quote user="DennisHeld"][quote user="Bucyrus"] [quote user="DennisHeld"][ That means that either CO2 levels cause temperature changes or temperature changes cause CO2 levels to change. They are strongly linked. But is it the chicken or the egg?Your point on the oceans being the source of the CO2 has been proposed. Problem: What's heating the oceans? Finding sources of CO2 in the atmosphere is easy. Finding a source of oceanic heating (other than CO2) is not. [/quote]Is it possible that atmospheric CO2 levels are rising because CO2 is being released from the oceans because they are being warmed by a natural atmospheric warming period?[/quote] What would be causing the 'natural atmospheric warming period'? Even if it's natural, there's a cause. [/quote]I don't know what would be causing a natural warming period, but they have happened in the past in instances such as the Roman Warming and the Little Climate Optimum.  It seems reasonable to believe that a natural warming period would warm the oceans to some extent.  And if it did, it would release more CO2, and some might believe the extra CO2 is man's contribution rather than a natural contribution of the oceans.  Moreover, they might conclude that the extra CO2 is causing the warming when actually the warming might be a natural phenomenon that is causing the extra CO2 to be released from the oceans.
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