If congress disagreed with this interpretation, they could pass a law explicitly ruling it out. The power of the supreme court in this regard relies on the fact that congress has great difficulty passing any law at all, and thus whatever interpretation given by the supreme court is likely to persist.

>If you look at the conservative majority opinions, you’ll find that indeed, it’s about the relevant legal issues, ie. what the law actually says.

The dissertation focuses on that. The actual reasoning might be based on something else. The court is strongly interested in projecting an image of being neutral, and of only going off of the wording of laws, rather than involving their own biases. Thus, the majority opinion should be read as an attempt to assign such a motive to their decision, whereas the dissenting opinions attempt to assign the opposite motive. That is, they attempt to suggest that the majority ruled this way because they are insufficiently worried about climate change.