Man changed climate for 8,000 years?

CNN/Associated Press ^ | Wednesday, December 10, 2003

[anymouse]

Beginning 8,000 years ago, atmospheric levels of carbon dioxide began to rise as humans started clearing forests, planting crops and raising livestock, a scientist said Tuesday. Methane levels started increasing 3,000 years later.

The combined increases of the two greenhouse gases implicated in global warming were slow but steady and staved off what should have been a period of significant natural cooling, said Bill Ruddiman, emeritus professor at the University of Virginia.

[LiteKeeper]

INTREP - It amazes me that the world has such a limited view of God, the Creator, and His ability to sustain the earth in a condition that is liveable. You may disagree, and that's fine, but those of us who believe He created the heavens and the earth, also believe that He sustains it.

Amazing the difference a Biblical/Christian Worldview can have on one's perspective.

[ancient_geezer]

Couldn't the chart just as likely demostrate that CO2 increase causes Temperature increase?

Actually no, numerous studies have been done comparing the temperature data as it correlates with rising CO2. The temperature percedes CO2 in such studies.

 

CO2-Temperature Correlations

• "(1) correlation does not prove causation, (2) cause must precede effect, and (3) when attempting to evaluate claims of causal relationships between different parameters, it is important to have as much data as possible in order to weed out spurious correlations.
  
  ***
  
  Consider, for example, the study of Fischer et al. (1999), who examined trends of atmospheric CO2 and air temperature derived from Antarctic ice core data that extended back in time a quarter of a million years.  Over this extended period, the three most dramatic warming events experienced on earth were those associated with the terminations of the last three ice ages; and for each of these climatic transitions, earth's air temperature rose well in advance of any increase in atmospheric CO2.  In fact, the air's CO2 content did not begin to rise until 400 to 1,000 years after the planet began to warm.  Such findings have been corroborated by Mudelsee (2001), who examined the leads/lags of atmospheric CO2 concentration and air temperature over an even longer time period, finding that variations in atmospheric CO2 concentration lagged behind variations in air temperature by 1,300 to 5,000 years over the past 420,000 years."

[ see also: Indermuhle et al. (2000), Monnin et al. (2001), Yokoyama et al. (2000), Clark and Mix (2000) ]

• "Other studies periodically demonstrate a complete uncoupling of CO2 and temperature "

[see: Petit et al. (1999), Staufer et al. (1998), Cheddadi et al., (1998), Raymo et al., 1998, Pagani et al. (1999), Pearson and Palmer (1999), Pearson and Palmer, (2000) ]

• "Considered in their entirety, these several results present a truly chaotic picture with respect to any possible effect that variations in atmospheric CO2 concentration may have on global temperature.  Clearly, atmospheric CO2 is not the all-important driver of global climate change the climate alarmists make it out to be."

---

 

Global warming and global dioxide emission and concentration:
a Granger causality analysis

http://isi-eh.usc.es/trabajos/122_41_fullpaper.pdf

•  "We find, in opposition to previous studies, that there is no evidence of Granger causality from global carbon dioxide emission to global surface temperature. Further, we could not find robust empirical evidence for the causal nexus from global carbon dioxide concentration to global surface temperature."

[ancient_geezer]

I believe your rendition is what the chart was meant to represent; I was having fun...

When comparing the actual data on which the charts were based, temperature does lead CO2 changes. See above. Have to remember that with a 400,000 year chart, one pixel width is more than 500 years in the size of the chart provided. The data relationships tell the real tale.

[Ole Okie]

Less than a million people 8,000 years ago causing global warming in ludicrous.

Now, now.

Those burning forests, those evil rice paddies and those farting oxen must be the cause.

The only thing is, who ate all that danged rice?

Oh, those global warming models search high and low. And when they're wrong (as they usually are), it is very convenient for someone to produce data explaining away the "anomoly".

As Mark Twain once observed, it'a remarkable what conclusions can be drawn from a little bit of data.

[BobS]

8000 years ago, those pharts apparently had implications!

[ChadGore]

The problem with our global warming friends is not that they know so much, but that they know so much that isn't so.

[BJungNan]

How is it that people think we are so powerful that we can change the weather when we can barely predict it from day to day?

[SunkenCiv]

Just adding this to the GGG catalog, not sending a general distribution.

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[SunkenCiv]

[SunkenCiv]

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