This is taken from
RealClimate...
What does the lag of CO2 behind temperature in ice cores tell us about global warming?
Filed under:
— group @ 3 December 2004 - (
![](/proxy.php?image=http%3A%2F%2Fwww.realclimate.org%2Fwp-content%2Fplugins%2Flangswitch_flags%2Ffr.gif&hash=05351214cd09fe6dd9becdb9115feff6)
)
This is an issue that is
often misunderstood in the public sphere and media, so it is worth spending some time to explain it and clarify it. At least three
careful ice core studies have shown that
CO2 starts to rise about 800 years (600-1000 years) after Antarctic temperature during glacial terminations. These terminations are pronounced warming periods that mark the ends of the ice ages that happen every 100,000 years or so.
Does this prove that CO2 doesn’t cause global warming? The answer is no.
The reason has to do with the fact that the warmings take about 5000 years to be complete.
The lag is only 800 years. All that the lag shows is that
CO2 did not cause the first 800 years of warming, out of the 5000 year trend. The other 4200 years of warming
could in fact have been caused by CO2,
as far as we can tell from this ice core data.
The 4200 years of warming make up about 5/6 of the total warming.
So CO2 could have caused the last 5/6 of the warming, but
could not have caused the first 1/6 of the warming.
You do not need a PHD in Climatology to understand what is being said there. The inconvenient truth is CO2 does not cause warming. Science says it doesn't. Some
scientists say it does, but not science.
As far as my model statement goes Daboss, I know that is not the dumbest thing you've read. Might be the simplest thing you can't understand. Here you go. The climate models were constructed by people. People decided on the parameters the models would use to make calculations. Each parameter is weighted against the other parameters. The Sun was given as a constant source. CO2 was given more weight than it has proven to deserve. That is why when the CO2 is increased in the model, an exaggerated result occurs.