Perhaps Harper's problem is watching too much US television. Recent ads put out by the Competitive Enterprise Institute (CEI) - an industry-funded lobby group - use the tag line "They call it pollution; we call it Life", in reference to CO2 being labelled a pollutant.
You have got to see these ads to believe them! They would be hilarious if they weren't so creepy!
The second one shows the titles of two papers they claim show that global warming is not causing the glaciers to melt. However, the conclusions of the actual papers mentioned make the opposite point. See here and here for an analysis.