People need food, shelter, and clothing before they are gonna give a shit about the environment.
Which says nothing about the environment being a luxury good. People need food well before they give a shit about shelter. Does that make shelter a "luxury good"?
People need food before they give a shit that they might be ingesting poison in that food. Does that make avoiding deadly toxins a "luxury good"?
IF a tidal wave certain to kill everyon within a mile of the coast is coming, and many people don't know about it or want to believe it, so they don't care? Does that make ability to avoid certain death by getting away from the coast, a "luxury good"?
A luxury good is NOT merely something that is less immediately essential than the most immediately essential things. It is not just a relative term, but and absolute term. It is something that is not at all essential or neccessary, meaning that never has any short or long term impact upon survival basic health.
In addition, demand for it cannot just be correlated with wealth. Amount of demand for nearly all goods, both neccessary and luxury (especially fossil fuels) are correlated with wealth.
To be luxury, it must have an exponential relation such that proportional increase in wealth produces an even larger proportional increase in demand.
As I explained in my other post, environment has the inverse of that relationship, and instead meets the expected relationship of a "necessity good".
Every person would die if they don't have access to non-toxic drinking water. Plenty of people could live just fine without fossil fuels. Just because our current dominant methods of food production depend heavily on fossil fuels, does not make such use neccessary. There is no reasonable criteria by which fossil fuels get categorized as neccessary but various basic aspects of the environment do not. Sure, some concerns about the environment, like survival of a particular almost extinct species are luxury. But the vast majority of uses of fossil fuels are luxury too. Even under the constraints of our current unnecessary methods, the amount of fossil fuels needed to supply anything that would qualify as essential is a tiny fraction of what we use.
This illustrates another important point that the very notion of categorizing a type of object or service as either "necessary" or "luxury" has no validity, because it it the where, when, how, and how much of something that is used that will determine whether that use was essential. A certain amount of clean water to drink is essential, as are a certain amount of calories from food. But watering one's lawn is not, and consuming many if not most of the foods we do and in the amounts we do are not, such as consuming a pound of beef, which means that neither are any of the things used in producing that beef, such as X amount of grains, water, and energy, which are determined by the way companies choose (not need) to do it to produce the beef we don't need in the first place. BTW, water is more essential to crops than fossil fuels, and numerous aspects of the environment including global climate issues are essential to having clean and plentiful water in the places we need it. The fact that the world's poor don't think that far ahead about what is essential because they are focused on the empty plate in front of them says nothing about those concerns being a luxury.