This visualization (image and caption) is great for discussing how different forms of toxicity take effect at different scales and systems. The chemical toxins from fossil fuels are a threat to the geo level of the land, the bio level of human and nonhuman bodies, and the eco/atmo level of atmospheric systems. And yet, the fact that something as toxic as fossil fuels are still seen as valuable is due to the toxic ways in which our global economy has been planned at the macro level and practiced at the micro level. The forms of discourse being deployed to combat these framings (at the meta level) are laced with white supremacy, and exclude and erase other perspectives and systems of value. The fact that this erasure of native people's experiences has been able to persist and remain effective is evidence of structures precluding deutero learning.
I think this image serves the author's argument, but I'd much rather see the posters! Perhaps you could include a few of these along with the image? I'd love to get a glimps of the visual rhetoric being deployed in this discourse. I dont know if you took pictures of these posters, but I think putting a couple of the right ones together with this image and a good title could create a pretty cohesive visual argument.
This visualization shows how efforts to combat, redress, and prevent the contamination of landscapes can become entangled with/index other forms of social toxicity. In this case, the toxin is white supremacy. The recreation-based struggle to preserve public lands from contamination with fossil fuels simultaneously participates in the exclusion and further subjugation of native populations in the area. Given that these populations have a stronger hold on the discourse, their narrative of fighting the good fight against the fossil fuels "conveniently erases Native histories and much contemporary Native presence," as the author points out.