Published by admin on 12 Oct 2008 at 03:47 pm
“If CO2 is of such critical importance to climate change why was there a large temperature rise prior to the early 1940s when 80 percent of the human produced carbon dioxide was produced after World War II? 2. When CO2 levels finally began to increase dramatically in the postwar years why was there a concomitant interval of about 30 years of cooling? One would think that if CO2 had such critical control over climate that the relative abundance of CO2 in the atmosphere would be in lock step with global temperature. Many researchers realize the difficulties that are presented by trying to make CO2 the key factor in climate change. As a result there has been renewed research, much of it in the past year or so, into the idea that there really is a connection between variability in solar output and global temperature.
“The media, special interest groups, and even some government produced literature all report that CO2 is the most important greenhouse gas. The number one greenhouse gas is actually water vapor. It’s something like 98 percent, by volume, of all greenhouse gases. I like the way that my colleague, Jan Veizer at the University of Ottawa, a world-renowned expert on the carbon cycle, lists the relative importance of greenhouse gases when he speaks on the topic. He points out that the number one greenhouse gas is water vapor, the number two greenhouse gas is water vapor, the number three greenhouse gas is water vapor, the number four greenhouse gas is water vapor and CO2 is a distant fifth. Of course, this list is somewhat facetious as there is only one type of water vapor. However, he lists the relative importance of greenhouse gases this was to indicate just how insignificant the tiny carbon dioxide cycle is to the water vapor cycle that it piggybacks on. To give you an example of this comparison lets consider the amount of CO2 in the atmosphere. In the 19th century, when the world was relatively unindustrialized the level of CO2 in the atmosphere stood at around 285 ppm. By 2003 the level of CO2 in the atmosphere, primarily the result of industrialization and land use changes, stood at 376 ppm. The resultant influence on climate has been minimal. Computer models say that this increase in CO2 should have heated the Earth up significantly by this stage. However, very little warming that can be attributed to CO2 has actually occurred.”
To read the rest of this talk by Dr. Tim Patterson, a paleo-climatologist at Carleton University who argues that changes in the sun’s output, not CO2, drive the climate, click here.