Yeah, that makes sense.

I would not phrase it that way, Thoritsu, but in a nutshell the answer is "Yes". I would myself phrase it that CO2 is a greenhouse gas but that the contribution of humans to climate is comparable to 'pissing in the ocean'...technically, this increases sea level. Practically speaking...

Here is a good article from this Sunday past: http://www.rationaloptimist.com/blog/wha...

Jan

Here is an excerpt from Kicking the Sacred Cow by John Hogan (his book on politics and funding in "science"):
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This, then, defines the notorious "greenhouse gases" that are going to stifle the planet. The one that
gets all the publicity is carbon dioxide, which human activities generate in five main ways: making cement
(CO2being driven out of the limestone used in the process); breathing; rearing animals; using wood
(which once harvested, eventually decomposes one way or another); and burning fossil fuels. This
translates into the release of about 3 million liters on average of CO2per human per year, for a grand
yearly total of 1.6 x 1016liters, or 30 billion tonnes.144(1 tonne = a "metric ton" = 1,000 kilograms =
0.984 ton.) The other gases, while present in smaller amounts, have a greater relative absorptive
capacity that ranges from fifty-eight times that of CO2in the case of methane to several thousand for
CFCs, and the amounts of them have been increasing.
This all sounds like something that should indeed be a cause for concern, until it's realized that the
atmosphere contains something like 1,800 billion tonnes of carbon dioxide already from such sources as
volcanoes, the outgassing of oceans, and the natural functioning of the biosphere. In other words, all of
human activity adds less than two percent to the gases that nature puts out anyway. And then it turns out
that all of these gases put together add up to a minor player, for the greatest contributor by far is water
vapor. Although the exact figure varies from place to place and season to season, water vapor is
typically present at ten times the concentration of carbon dioxide; further, it is active across the whole
infrared range, whereas heat absorption by CO2is confined to two narrow bands. Without this natural
greenhouse mechanism, the Earth would be about 33oC cooler than it is, which would mean permanent
ice at the equator. Estimates of the contribution of water vapor vary from 95 to 99 percent, thereby
accounting for somewhere around 32oC of this. The remaining one degree is due to other gases. The effects of all of human activity are in the order of two percent of this latter figure. But, of course, you
can't put a tax on water vapor or lambaste your favorite industrial villains for producing it, and so water
vapor never gets mentioned in the polemics. Even professionals uncritically buy the publicized line. An
astronomer reports that in an impromptu survey, six out of ten of her fellow astronomers replied "carbon
dioxide" when asked what was the major greenhouse gas.
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