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Final-Fan said:
CO2 production from increased industrial activity (fossil fuel burning) and other human activities such as cement production and tropical deforestation has increased the CO2 concentrations in the atmosphere. Measurements of carbon dioxide amounts from Mauna Loa observatory show that CO2 has increased from about 313 ppm (parts per million) in 1960 to about 375 ppm in 2005. The current observed amount of CO2 exceeds the geological record of CO2 maxima (~300 ppm) from ice core data.

Over the past 800,000 years, ice core data shows unambiguously that carbon dioxide has varied from values as low as 180 parts per million (ppm) to the pre-industrial level of 270ppm.

http://en.wikipedia.org/wiki/Greenhouse_effect

It's quite a coincidence if the current CO2 levels are 25% higher than at any point in geological history, almost 40% higher than a few hundred years ago, and increasing at a remarkable pace to say the least, and yet we are responsible for almost none of it.

If you watched the videos I provided earlier, they talked about a published and peer reviewed paper that demonstrated that the expected temperature increase from doubling CO2 levels is 1 degree ...

Basically, in order to increase worldwide temperatures by the alarmist prediction of 5 degrees over the next 100 years CO2 levels would have to go up by 32 times their current level ...