Jack Century, a Climate Project presenter and geologist from Calgary, has just published a letter to the editor where he explains:
In 1903, Svante August Arrhenius, after making thousands of painstaking calculations, became a Nobel Prize laureate in chemistry for being the first to prove that carbon dioxide in the atmosphere was the dominant cause of global temperature changes.
In 1987, Norman D. Newell documented the near-perfect statistical correlation between the increase of CO2, carefully measured by Charles David Keeling on top of Mauna Loa, and the detailed growth of population rigorously calculated by others. The correlation between CO2 and people was 0.9985.
In many of my presentations, people have questioned the correlation between CO2 & human activity, and this is a clear concise explanation of this Anthropocene Epoch.
http://www.canada.com/calgaryherald/news/letters/story.html?id=2ed107e4-ea72-4569-a1ec-041a291f6a59
