[Dark Knight]

No, you had the zeroes right. And some sources say O.039%.<<

And H2O is 400 times more responsible as a greenhouse gas for warming and cooling the Earth. If your model does not model H2O accurately...

DK

(or 40,000% more responsible)

[palmer]

And H2O is 400 times more responsible as a greenhouse gas for warming and cooling the Earth

In the short run. See my link above. The short run means that water vapor (and clouds) reflect more or less short wave and capture more or less long wave energy. Those changes can result in planetary changes in temperature ("global average temperature") of 0.1C in just a week. Meanwhile the theory says that CO2 might add 0.1C in a decade or more provided there are no negative feedbacks. So while H2O is more responsible it also fluctuates and gets capped by natural processes like rain.