Well, it depends on how much outside factors affect these things you can afford to give up. For example, it would be more difficult to give up driving a large van if you are the main driver for your family (especially if you also take care of your elder relatives at home).
Plus, because we are so used to such a spendthrift lifestyle in North America, there may be some things that don't even enter our mind. It's not really ignorance, but forgetfulness or the "Oh, I honestly didn't know we have a better option."
I recently promised myself that I will never buy brand new clothes again. This has some exceptions of course because of hygeine and size (I am very small but wearing children's clothes to work is bad). It was something that I did not think of until my roommate told me he found some very nice clothes at Goodwill (Canadian secondhand store that also acts as charity), even though I already buy majority of my books and furniture secondhand and use bicycle, bus or walking as my main transportation.
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