23. But of all the greenhouse gases, carbon dioxide represents only about ¼ of 1% of the greenhouse effect, hardly  a device to drive the massive energy system of earth’s climate.
Hieb, M., 2003, Global Warming: A Closer Look at the Numbers, in Hieb, M. and Hieb, H., 2003, Global Warming: A Chilling Perspective: http://www.clearlight.com/~mhieb/WVFossils/Ice_Ages.html, accessed 2/14/06