This is not intended to bash Alberta. But let's look at some federal government stats and work from there.
In raw terms, Alberta's GHGs passed Ontario's in the past few years. I expect it has a lot to do with the tar sands and the energy needed to process that goo. I cannot see how an Albertan needs to consume more energy than an Ontarian. The weather is about the same.
As consumers our appliances and vehicles consume less energy over time with new technology. My laptop consumes 90W, my old desktop had 360W. There are many other examples like that.
I hate nuclear, but it may be a stop-gap for 20 years or so while Alberta could switch to renewables and more energy efficiency with things like zero net power buildings and the like. If you want to rule out nuclear, you won't hear a peep from me.
In terms of business opportunity, there are many more job opportunities in energy efficiency and clean energy. People will pay Alberta through no government program at all to reduce emissions.
I could set up a crowdfunding site, and if I had a decent business plan and a high probability of execution, people would give me money expecting no return to clean up Alberta. There would be a huge amount of good will for this.
Alberta not only has the right to cut carbon emissions, but it has the right to make money and jobs doing so. It may even be more lucrative than Big Oil.
I would go after the coal-fired plants first. Of course there are many in the coal industry who will fight me tooth and nail on this. Changing those to natural gas would reduce by 3 million tonnes, and changing them to nuclear would reduce by 6 million. It would be a good start.