[NYorkerInHouston]

I wouldn't show that particular graph around here if I were you.

After all if you ignore the blue line and focus on the red (the CO2 ppmv data) then it appears to show that we have a current level about 25% higher then at any time in the past 400,000 years.

[GregoryFul]

If you look at both the blue and red traces, you will see that CO2 is an effect of temperature changes, not a cause. Sometime after the temperature starts rising, CO2 starts rising. Sometime after the temperature falls, CO2 falls.

[HighWheeler]

"I wouldn't show that particular graph around here if I were you.

After all if you ignore the blue line and focus on the red (the CO2 ppmv data) then it appears to show that we have a current level about 25% higher then at any time in the past 400,000 years."

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Which shows that higher level has negligable effect on the temperature.

[redangus]

Actually it is less now than 325,000 y/a and about the same as 125,000 years ago. It seem the CO2 levels and temperature go up and down on a pretty reliable schedule. About every 125,000 years both go up. We would seem to be at about the high point of that 125,000 peak and should be dropping off soon.

This graph brings up a question. Do the temps go up because of CO2 or do CO2 levels go up as temps rise?