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Luxury: "something adding to pleasure or comfort but not absolutely necessary"

Talking, walking, breathing air, drinking water, eating cereal or local vegetables are not luxuries

Talking to friends over phone, taking your car to gym to then run on a treadmill, drinking anything but water, smoking, eating meat/fish/dairy products/processed food are luxuries

[robocat]

Your comment implies very deep inconsistency: your examples have no pattern that others outside of your circle might agree upon. Why should your personal "definition" of luxury be a golden standard for all?

Cereal is an internationally traded commodity - the polar opposite of local produce. Local produce is often an expensive luxury in my experience. Even in my hippy experiences I don't think I've ever met someone who has grown their own oats.

You define talking to friends over phone as a luxury - why? Is having time and opportunity to talk to friends in person a luxury?

Are food standards a luxury?

Is potable tap water a luxury?

Historically beer was a means of providing safe drinking water. Was it a luxury when used for that purpose?

Is commenting on an internet forum using your mobile phone a luxury?

I am probably being provocative. However I think the questions above are simply implications of my comment.

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Commenting on internet is not too much luxury when it's an attempt to educate or act for the environment

Boiled water is not a luxury is that's the only way to get non-contamined water, but no need to transform it in beer. Electricity, internet, buildings, trucks transporting non-luxurious food are also base products in our cities, many people need it, but some of their usage become luxurious. For example water plastic bottles when not reused, many devices like air conditioners, usage of internet like streaming, oversized houses/apartments, many usages of personal cars are luxuries by definition (not necessary)

Talking to emergency or for a practical action is possibly non luxury, if it saves a life or save more polluting ways of communication, but spending hours talking to friends is luxury

I'm maybe including "non-sustainability" into luxury, but it's related to necessity, because when you have multiple type of foods, like cereals, vegetable, meat, some are scalable, some are not