I'll tackle that. I actually have several pages in my brief talking about all of the international declarations and resolutions that recognize the right to a healthy environment. When you combine those international resolutions and declarations with the state practice of 170 out of 192 UN nations now, the right to a healthy environment is very close to becoming a principle of customary international law or a general principle of international law, in which case it becomes binding on Canada regardless of whether we have domestic recognition of it.
In some ways, the Canadian environmental bill of rights that is being put forward represents a recognition of what is very close or may already be an international obligation to recognize this right.