(Image: AAP/Joel Carrett)

One cold and cloudy weekend in Cambridge, an Australian zoologist decided to take a break from counting invertebrates and start counting something equally spineless: letters to the editor in The Australian. 

Philip Erm, a PhD student at the University of Cambridge, trawled through every letter to the editor published on Factiva -- a news archiving database owned by News Corp -- over the past six months to find out how many climate-focused letters denied climate change.

The result? Of the 306 letters addressing climate science, a whopping 67% were opposed to it. Just 16% supported it, and the rest were somewhere in between.