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@peterbrown @straphanger so, I am in favour of Alto.

But.

The reduction in greenhouse gas emissions from Alto are not projected to be high, about 1Mt/year -- that's about 0.1% of Canada's total annual emissions around 700Mt.

And the high cost of the project, about $60-90B, makes it a very expensive way to reduce a modest amount of emissions.

So, one reason I've heard people oppose the project is that the money could have a lot more climate impact if it was used in other ways.