Might co2 respond to temperature?

At http://tallbloke.wordpress.com/2013/04/30/paper-gives-new-clue-to-the-de… … reposted from http://hockeyschtick.blogspot.co.uk/2013/04/new-paper-demonstrates-tempe… and the abstract to the paper is at www.nature.com/nclimate/journal/v3/n5/full/nclimate1817.html where the question is posed – does co2 cause temperature to rise or does rising temperature cause co2 levels to rise? In other words, have climate scientists and their baggage train been telling porkies, pulling the wool over the eyes of the average joe. I'll leave you to decide – but really, it's still up in the air, whatever.