a place to rant about energy, environment and all things John Howard

Sunday, August 20, 2006

Some scary global warming graphs

This graph shows the correlation between atmospheric concentration of CO2 and temperature over Antarctica for the past 400,000 years:
This graph shows atmospheric concentration of CO2 as recorded by Mauna Loa Observatory in Hawaii since 1958:
Putting these two graphs together, along with forecasts for atmospheric concentration of CO2 in 2100, you get this (very tall) graph...
Which is clearly nothing to worry about.

17 Comments:

Anonymous Prof James Barrante said...

Unfortunately, you are assuming that the CO2 is driving the temperature change. In fact (a dirty little secret), its the other way around. Global temperature changes drive the CO2 levels in the atmosphere. Look at your graph! About every 100,000 years we get a temperature spike. Then it turns around. We are about at a maximum now. Global temperature hasn't risen since 1998. Certainly, human activity could not have been responsible for the temperature spikes 200,000 years ago. Read one of your countrymen, Prof Bob Carter, James Cook Univ. Queensland.

Wed. Feb. 14, 09:13:00 am

 
Anonymous carbonsink said...

I said nothing about causation, I merely pointed out the correlation.

That said, the fact that increases in CO2 lag temperature increases (by about 800 years from memory) really only tells you that the first 800 years of warming was not caused by an increase in CO2. For the remainder of the deglaciation the increase in CO2 creates a positive feedback loop that drives temperatures higher.

What humanity has done is add to that positive feedback loop by pumping gigatonnes of CO2 into the atmosphere at the very peak of an interglacial.

And FWIW, I read most of what Bob Carter writes, and IMHO he's is a complete nutter.

I'll finish with a quote from Jeff Severinghaus who emailed me today:

Every time that carbon dioxide rose in the past, at the ends of ice ages, temperature also rose. The converse is not true, as we found in our ice core research. Every time temperature rose, carbon dioxide DID NOT necessarily rise. In fact, we found that there are warmings of about 800 years at the very beginning of the deglaciations that were not accompanied by CO2 increase.

What this means is that there are other things besides carbon dioxide that cause temperature increase. It does not mean that carbon dioxide does not cause temperature increase, nor does it mean that Gore was wrong.

Mon. Mar. 12, 04:48:00 pm

 
Anonymous Anonymous said...

last I checked ore wasn't a scientist he was a politician and the makes me very skeptical on any thing he would have to say on anything. as far as global warming goes I would say enjoy it if we are to feed the people of the world we need it and the more carbon in the air the more the plants flourish hence, more food. sounds like a fair trade off to me. Now if we do happen to go into a global cooling trend which I have a feeling is more likely with the research that I have seen and read you better be figuring out how we will keep people from freezing to death.

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