That may be correct. (I don't know for certain, but it sounds plausible)

Hardly anyone took overseas holidays back then, so no aviation worth mentioning.

Car ownership was much much lower, so a lot less travel in general.

People ate less meat and we didn't import food with all the costs associated with frieghting it.

They owned a lot less 'stuff' and no electronic gadgets. Far fewer items of clothing and things were repaired rather than instantly buying a new one.