Re: Interesting AGW article!

On 12/14/2009 3:21 AM, Joe wrote:
On 2009-12-14, Tom S.<tmswork@xxxxxxx> wrote:
Cite?

*A*verage global temperatures in the *Early* *Carboniferous Period
*were* hot*- approximately *20° C (68° F)*. However, cooling during the
Middle Carboniferous reduced average global temperatures to about *12° C
(54° F)*. As shown on the chart below, this is comparable to the average
global temperature on Earth today!

Similarly, atmospheric concentrations of *carbon dioxide* (CO2) in the
*Early Carboniferous Period* were approximately *1500 ppm* (parts per
million), but by the *Middle Carboniferous* had declined to about *350
ppm* -- comparable to average CO2 concentrations today!

Earth's atmosphere today contains about 380 ppm CO2 (0.038%). Compared
to former geologic times,* *our *present *atmosphere,* *like the *Late
Carboniferous* atmosphere, is* CO2- impoverished!* In the last 600
million years of Earth's history only the *Carboniferous Period *and our
present age, the *Quaternary Period, *have witnessed CO2 levels less
than *400 ppm*.

Global Temperature and Atmospheric CO2 over Geologic Time

*Late Carboniferous* to* Early Permian* time (315 mya -- 270 mya) is the
only time period in the last 600 million years when *both* atmospheric
*CO2 *and *temperatures *were as low as they are today* (Quaternary
Period ).*

Temperature after C.R. Scotese http://www.scotese.com/climate.htm
CO2 after R.A. Berner, 2001 (GEOCARB III)
<http://www.geocraft.com/WVFossils/Reference_Docs/Geocarb_III-Berner.pdf>

There has historically been much more CO2 in our atmosphere than exists
today. For example, during the *Jurassic Period* (200 mya), average CO2
concentrations were about *1800 ppm* or about 4.7 times higher than
today. The highest concentrations of CO2 during all of the Paleozoic Era
occurred during the *Cambrian Period*, nearly *7000 ppm* -- about 18
times higher than today.

The *Carboniferous Period* and the *Ordovician Period *were the* *only
geological periods during the Paleozoic Era when *global* *temperatures
were as low as they are today*. To the consternation of global warming
proponents, the Late Ordovician Period was also an *Ice Age *while at
the same time CO2 concentrations then were nearly 12 times higher than
today-- *4400 ppm*. According to greenhouse theory, Earth should have
been exceedingly hot. Instead, global temperatures were no warmer than
today. Clearly, other factors besides atmospheric carbon influence earth
temperatures and global warming.
Exxon/Mobil. Bush. Cheney. Darth Vader.
You forgot Halliburton! Come on, Joe, get with the program! :-P
.

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