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http://cfc.geologist-1011.net/

Volcanic Halocarbons: Chlorofluorocarbons (CFCs) in Volcanic Emissions
Abstract
"Although commonly regarded as not naturally occuring, halocarbons and chlorofluorocarbons (CFCs) do occur naturally and are emitted from volcanoes."

What does a "normal global average" mean? What is normal and what is natural variation?

The "years before present" in one of those is years before about 2000.
I thought xkcd put it well. It's not just the temperature but the rate of change of temperature which is unnatural.

What does a "normal global average" mean? What is normal and what is natural variation?

CFCs are naturally emitted by Earth volcanoes apparently in small amounts. As an interesting bit of off-topic trivial, there's some speculative research that CFCs may be a significant part of lunar volatile compounds (based on some thermodynamic modeling research), but nobody will know for sure until someone drills into some trapped volatiles.

Hrm...funny how you can measure them out of volcanoes:

http://cfc.geologist-1011.net/

"CFCs are not Volcanic" - Oh Really?

"This statement is one that I keep seeing on websites and blogs, and ties in with the assertions repeated by Warrick & Farmer (1990), Grimston (1992), Hendeles et al. (2007), Colice (2007), Colice (2008), and Green & Stewart (2008, p. 18) to the effect that CFCs are not natural in the environment. If one chooses to measure the gases emerging from volcanic vents instead of taking a politician's word for it, one discovers that volcanoes produce a variety of halocarbons, including CFCs. This fact, along with other natural sources of CFCs including sponges, other marine animals, bacteria (both marine & terrestrial), fungi (both marine & terrestrial), plants (both marine & terrestrial), lichen, insects, is so well documented that it is the subject of ongoing textbook publication (Gribble, 2003; Jordan, 2003). Stoiber et al. (1971) first measured and documented CFCs venting from Santiaguito in Guatamala. Since, there have been many studies corroborating the volcanic emission of CFCs (Isidorov et al, 1990; Isidorov et al., 1993; Jordon et al., 2000; Schwandner et al., 2000; Schwandner et al., 2002; Schwandner et al., 2004; Frische et al., 2006). Although some authors attempt to correlate volcanogenic CFCs to atmospheric variations, the confirmation of soil diffusion decay with distance from the vent (Schwandner et al., 2004) still stands in stark contradiction of Frische's hypothesis."

I find it odd that the theory of evolution is shown in a light of being an evolving science which is correct in that the theory changes as more and new evidence is discovered. Yet the theory of climate change is shown as more of a dogma where the scientific community is a consensus which it is not and any dissent to the contrary is put down as being "unscientific".

There is plenty of evidence refuting the claims of anthropogenic climate change which is available to anyone who has an internet connection and can find google.com

Teaching science as a dogma is contrary to the scientific method. The ACC folks just can't see that the dogma they're teaching is just as bad as the scientific consensus against plate tectonics which was taught in schools well into the 60's. Real science is not a consensus. Only in the fullness of time will the truth be discovered but wrecking our economy in the name of a theory which is far from proven is the wrong way to go.

Here is a particularly scholarly site which puts the "ACC consensus" in the proper light. http://geologist-1011.net/

Whoever modded this insightful is retarded. In no point in recorded history, or in the estimation of past CO2 levels, has the level of CO2 ever been 10 times the current amount.

Be careful who you call retarded. You're gonna feel really stupid when someone comes along and proves you wrong.

OOH! OOH! Let me!

HERE ya go!

Did that not work? Try this one:

Present atmospheric carbon dioxide concentrations are not unprecedented in geological history. Throughout the Phanerozoic spanning the past 600 million years, carbon dioxide concentrations have been sporadically falling from well above 6000ppm (Berner, 2001). Carbon dioxide has risen before, only to be sequestered in its unstoppable decline to an all time low of 200ppm - in the midst of human history.

To put that in perspective, the current levels are around 339ppm. If you are not good at math, 6000 is more than 10 x 339.

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Glad I could help.