What is the test for national recognition of a national concern?

Canada (Federal), Canada

The following excerpt is from Reference re Greenhouse Gas Pollution Pricing Act, 2021 SCC 11 (CanLII):

The second factor is whether international agreements related to the matter exist (para. 149). This, as Rowe J. makes plain, undermines Attorney‑General for Canada v. Attorney‑General for Ontario, 1937 CanLII 362 (UK JCPC), [1937] A.C. 326 (P.C.). Further, it serves as no constraint whatsoever on the recognition of a national concern. That is, while the absence of international agreements will not militate against recognition of a national concern, the presence of such agreements — depending on their content — may support recognition of a national concern.

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