Key Question
Theoretically, but no government, Liberal or Conservative, has done so because of the damage it would cause to public services, well-being and the economy.

The cost for Canada to meet its Paris Agreement target of a 30% emissions reduction from 2005 levels by 2030 is easily a trillion dollars, although exact figures are impossible to determine. The cost would be the sum of three factors:
1 – the cost of all the federal, provincial, municipal, and other actions to reduce greenhouse gases (GHG) to date. This has been going on for decades, and there is no comprehensive list of these programs available, let alone the total cost of them. At the federal level, for example, Canada has been setting GHG emission reduction targets, and implementing emission-reduction measures, since 1992. It is reasonable to assume the amount spent to date by government greatly exceeds $100 billion.
2 - the cost of continuing many of the existing measures until 2030, plus those already approved (existing plus approved policies is referred to as “promised policy”). Again, the cost is unknown because no complete listing of these programs has been assembled, let alone their total cost tabulated. It is reasonable to assume the amount to be spent by 2030 by governments at all levels exceeds $100 billion.
3 - the cost of measures that will need to be taken to address what has been called the “Paris Gap.” This is the amount that must be spent to bring Canada’s overall GHG emissions down from what would occur in 2030 as a result of promised policy to Canada’s actual target level of 30% below 2005 levels. The magnitude of the Paris Gap is huge, estimated at 112-megatonne (MT).
Unlike the first two costs, some good numbers have been published concerning the Paris Gap price tag.
In “Mind the (Paris) gap: The economic impact of the Paris commitment on Canada,” published on July 13, 2020 by the Alberta-based Canadian Energy Centre, it was found that closing the Paris Gap would result in:
The Friends of Science Society (FOSS) summed up the situation well in this video.
This is precisely why no government to the present has come even remotely close to meeting their promised targets.
Here are the targets, and the results. See the graph further down the page for a visual representation of what was promised (numbers indicate targets in the following list) and what actually occurred.

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