Climate change scholars: Change is natural |

Climate change scholars: Change is natural

To the Editor:

Two people have responded to my letter on the global warming hoax. Both authors quoted papers for manmade global warming. However, for every one, there are papers that argue against. For example, Climatologist Roy Spencer of the University of Alabama quotes on his blog that "evidence from my group's government-funded research … suggests global warming is mostly natural and the climate system is quite insensitive to humanity's greenhouse gas emissions."

This viewpoint by Dr. Spencer fits in nicely with the statement I made that manmade CO2 is in not the prime driver of climate change. In my letter I mentioned that based on the detailed temperature records for the last 113 years there is a very poor correlation with CO2 and temperature increase. The reference for that article is Joseph D'Aleo, executive director of International Climate and Environmental Assessment Project. The best statistical fit for the last 113 years of temperature data is the 30-year ocean cooling cycle. He predicts 20 more years of cooling.

The best summary of the debate for me is Fire, Ice and Paradise, by H. Leighton Steward. In his book he gives a geologic perspective to the problem. Based on the 600 million fossil record there is no correlation of CO2 and temperature. The book also documents that there has never been a constant climate. There have been more than 20 glacier cycles in just the last 2 million years. In the last 400,000 years, we have good ice core data that documents four major glacial cycles. In those cycles there is a correlation of CO2 and temperature. However the details of those cycles show that the increase of CO2 lags behind the temperature increase. If CO2 were the cause of these cycles, it would have to increase before the temperature went up. The cycles of the last 400,000 years are widely accepted as being caused by the elliptical shape of the earth's orbit and not by CO2.

Steward's book and the 2008 article by David Archibald documents one of the strongest arguments against the global warming theory. Archibald's research shows the effect of CO2 on the atmosphere decreases as the CO2 increases on a logarithmic scale. In simple terms, that means the first 20-ppm of CO2 in the atmosphere has a greater effect than the next 400 ppm. If this is research alone is correct – it's a hoax.

Tim Schowalter

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