It’s not accurate to say Nitrogen fertilizers are ‘byproducts’ of natural gas production. They aren’t. Nitrogen fertilizer production consumes natural gas, and requires pretty significant infrastructure. It’s a deliberate choice to leverage cheap and abundant natural gas to meet industrial need. While Canada does have Sulfur as a byproduct of oil production, and that makes its way to some fertilizer as a cheap input, that’s very separate.
There’s nothing about us expanding natural gas production that would necessarily result in more nitrogen based fertilizer. If there’s a business case to be made for another fertilizer supply chain in Canada along side more NG production because the NG will be right there and cheap, great; but if that’s the case, it could be done right now if it priced out profitably.