[Donald Rumsfeld Fan]

I would not completely discount the possibility that increased CO2 levels could alter the climate,

Or maybe a changing climate is altering CO2 levels.

[Always Right]

Or maybe a changing climate is altering CO2 levels.

yeah, that seems to have happened before

[reg45]

a changing climate is altering CO2 levels

Bingo!

If you heat a bottle of club soda, you will drive off the carbon dioxide that's dissolved in the water. In the same way, if you heat up the oceans, you will also drive off dissolved carbon dioxide. This explains why the CO₂ peaks lag behind the temperature peaks in the ice core data. Increased atmospheric CO₂ is an affect of, not the cause of global warming.

[jnsun]

"Or maybe a changing climate is altering CO2 levels."

BINGO. As a planet warms, FOR WHATEVER REASON, the atmosphere shifts toward heavier gases (like CO2 vs N2 and O2) as the lighter ones achieve escape velocity.

Also a Rumsfeld fan. In response to a reporter's inane comment - Rumsfeld: "there are things we know we know, things we know we don't know, and things we don't know we don't know."