I, a colonizer by birth and person of average shittiness, care deeply about the environment, because I live in it. I'd have to be profiting pretty obscenely from destroying humanity's future to budge that balance of self-interest. But as a regular working-class person, nothing I earn in my entire lifetime could possibly outweigh -- nor secure -- personal access to clean air and water, healthy food, and the natural beauty of our land.
In this context, the only distinction I see between myself and a "noble savage" is that indigenous people have, if anything, a stronger and more legitimate sovereign claim to Canadian territory (along with a tradition of more direct reliance on it). Why wouldn't they care? And maybe they don't care more than anyone else, especially relative to how they're personally impacted. But whether from care or convenience, they are vastly over-represented among the people that actually show up and put their bodies on the line opposing environmental destruction. They're 5% of our population, yet as best I can estimate a plurality across front lines nationwide.
With the billionaire class consistently getting to do whatever they want to the planet, it's very easy to forget: Even in the face of so much pro-business propaganda permeating our media, environmental protection is actually one of the areas where the rest of the world is not very divided at all.
Besides...the more "civilization" I see, the more attractive the label "savage" becomes.
I wouldn't worry about that. Getting by presidential veto requires a two-thirds vote.