Actually, Dion single handedly saved the Montreal Protocol from collapse. Canada led the world in framing the agreement that led to significant action to deal with the ozone crisis. Later, under the Liberals not much was done about climate change. That is, in part, because of the ridiculous division of powers in this country: nothing could be done withour provincial agreements and, given Alberta's oil dependency, just like today, nothing is done.
The Liberals had made some agreements with the provinces under Chretien/Martin. One of the forst acts of Harper was to cancel the little progress that had been made.
So what actions did Canada take? Signing an agreement isn't an action.
Please list what actions happened under the Liberals, other than words and vague promises.