The following graph comes from a website titled Friends of Science, here.
The graph shows that surface atmospheric temperature correlates closely with "sunspot cycle length", and not with increasing atmospheric carbon dioxide levels.
This supports the observations that warming causes carbon dioxide levels to increase, not the other way around. The data for this graph needs to be carefully documented and verified. Can anyone do this?
Above graph after Friis-Christensen & Lassen - 1991, [Science 254, #5032] adapted by Dr. Tim Patterson.