Answer:
The answer is: A family's basic sustainable habits.
Step-by-step explanation:
The examples mentioned in the text represent basic things that one can do without any problem to live a sustainable life and give the example to others, that is the reason why I decided to add the word "basic" to the topic. Habits is mentioned as well because this family has adopted this way of living, they do that all the time which means it has made into a habit. And finally, the word sustainable means to be environmental friendly.