Since taking office in 2006, the Canadian Conservative Party government led by Prime Minister Stephen Harper has reduced greenhouse gas emissions from 749 to 726 (Mt) of carbon dioxide equivalent (CO2 eq). From 1993 until 2006, the previous liberal government increased greenhouse gas emissions from 600 to 749 (Mt) of carbon dioxide equivalent (CO2 eq).
Copied from Wikipedia. Original source:
http://www.ec.gc.ca/indicateurs-indicators/default.asp?lang=en&n=FBF8455E-1
On December 15, 2011, the Government of Canada officially notified the UNFCCC that Canada would exercise its legal right to formally withdraw from the Kyoto Protocol. To fulfill its obligations under the Protocol, Canada would have had to purchase a significant and costly amount of international credits using funds that could be invested here, in Canada, on domestic priorities, including the environment.
From an environmental perspective, the Kyoto Protocol has not served the international community well in meeting the real challenges of global climate change or effectively engaging all major economies. The Protocol only covers countries responsible for a small, and increasingly smaller, percentage of global emissions and, as a consequence, is not an effective vehicle for addressing the global challenge of climate change. Importantly for Canada, the United States, which is Canada’s biggest economic trading partner and is responsible for nearly 20% of global emissions, is not covered by the Kyoto Protocol.
These issues have led Canada to focus its efforts on the development of a fairer and more comprehensive global agreement based on the Copenhagen Accord, the Cancun Agreements and the Durban Platform. This includes implementing domestic measures toward achieving Canada’s GHG emissions reduction commitments.
whether or not it makes sense, and whether or not the "rationale" justifies the decision to totally abandon the Kyoto Protocol, those are different topics.
But trying to claim that PC does a better job using results beyond 2006 doesn't seem to be fair, after all, the Liberal lost the election in 2006, people would argue that, if they were able to stay in power, the Liberal would have beaten PC on this considering that they have committed to a very challenging target.
If I were PC, I wouldn't go in this direction, to me, it's a tough sell, it might do more harm than good. :)