So good to see the arroganti out in force.

Agro is his usual dismissive self while Mr Redux has a bob each way on AGW.

The graph could be clearer.

The point it makes has not been addressed.

The point is does increased CO2 have a declining RATE of warming. To be perfectly clear: does every further CO2 added to the atmosphere have less warming effect than the preceding ones?

If that is the case and how could it be otherwise given Beers Law, then what effect would that have on official estimates of climate sensitivity which factor in estimates of future temperature rise which could only be based on further CO2 having the same or greater temperature effect then preceding CO2 increments?

That last question was primarily directed to Bugs, who is becoming more ignorable, who opined that the IPCC and whatever other wretched groups are still supporting the AGW scam, take the 'log decline' into effect when calculating climate sensitivity.

Obviously they do not, for reasons I present above and because they say the very opposite:

http://www.ipcc.ch/publications_and_data/ar4/wg1/en/ch2s2-3.html#2-3-1

The IPCC says:

"Note that for CO2, RF increases logarithmically with mixing ratio."

That is the radiative forcing, RF, INCREASES.

This is the basis of the scientifically ludicrous AGW idea of a runaway temperature from CO2 emissions, or the Venus effect.

I just love the supercilious tone and comments from the pro-AGW boys; all wrapped up in completely anti-scientific nonsense.

...and cohenite is an expert on anti-scientific nonsense....

(Waves to cohers:)

February 2014: 398.03 ppm
February 2013: 396.80 ppm

You would have to go back at least 15 million years to find carbon dioxide levels on Earth as high as they are today, a UCLA scientist and colleagues report Oct. 8 in the online edition of the journal Science.

"The last time carbon dioxide levels were apparently as high as they are today — and were sustained at those levels — global temperatures were 5 to 10 degrees Fahrenheit higher than they are today, the sea level was approximately 75 to 120 feet higher than today, there was no permanent sea ice cap in the Arctic and very little ice on Antarctica and Greenland," said the paper's lead author, Aradhna Tripati, a UCLA assistant professor in the department of Earth and space sciences and the department of atmospheric and oceanic sciences.

"Carbon dioxide is a potent greenhouse gas, and geological observations that we now have for the last 20 million years lend strong support to the idea that carbon dioxide is an important agent for driving climate change throughout Earth's history," she said.

By analyzing the chemistry of bubbles of ancient air trapped in Antarctic ice, scientists have been able to determine the composition of Earth's atmosphere going back as far as 800,000 years, and they have developed a good understanding of how carbon dioxide levels have varied in the atmosphere since that time. But there has been little agreement before this study on how to reconstruct carbon dioxide levels prior to 800,000 years ago.

I love C3 graphs:

Co2 and temperature:

http://c3headlines.typepad.com/.a/6a010536b58035970c01a73d5ebffd970d-pi

I mean that's brilliant! Visible indisputable proof that CO2 cools!

Between 1914 -1963 CO2 went up 18 ppm and temperature 0.49C; from 1964 -2013 CO2 went up 76 ppm and temperature only went up 0.47C. CO2 COOLS!

And what about this one showing temperature and CO2 increase since 1997; CO2 is going through the roof and temperature no where and note all the temperature graphs are just 2nd degree polys which should please grumpy Agro who hates higher order polys:

http://c3headlines.typepad.com/.a/6a010536b58035970c01a73d628052970d-pi

Every graph on this page is a delight which should astound and amaze every person who loves science:

http://www.c3headlines.com/modern-temperatures-chartsgraphs.html

Only grumps, groupies and AGW odds and sods would disagree.

Climate Myth...

CO2 was higher in the past
"The killer proof that CO2 does not drive climate is to be found during the Ordovician- Silurian and the Jurassic-Cretaceous periods when CO2 levels were greater than 4000 ppmv (parts per million by volume) and about 2000 ppmv respectively. If the IPCC theory is correct there should have been runaway greenhouse induced global warming during these periods but instead there was glaciation."
(The Lavoisier Group)

Over the Earth's history, there are times where atmospheric CO2 is higher than current levels. Intriguingly, the planet experienced widespread regions of glaciation during some of those periods. Does this contradict the warming effect of CO2? No, for one simple reason. CO2 is not the only driver of climate. To understand past climate, we need to include other forcings that drive climate. To do this, one study pieced together 490 proxy records to reconstruct CO2 levels over the last 540 million years (Royer 2006). This period is known as the Phanerozoic eon.