This is a very fascinating and literate article on volcanic CO2 for anyone interested in such. It was written by Timothy Casey, an Australian petroleum geologist, and so some will immediately dismiss it. I found it a beautiful review of our present knowledge with regard to volcanic and other forms of magmatic CO2 emissions, and the problems to be encountered in carbon isotope analysis of CO2. Also, there is buried, deep in the article, a plausible alternative cause for our current warming cycle having nothing to do with CO2 that I have not seen suggested anywhere else. The discussion Casey has provided also may be relevant to explaining why satellite sensing of CO2 emission show heavy emission in some of the least populated areas of the earth, central Africa for instance.
For those of you after serious scientific detail with regard to the current "climate change" issue that we previously referred to as AGW, this is a great read.
http://carbon-budget.geologist-1011.net/