In swimming pools, special devices are used to remove dirt from the water. That means that you don't need to change the water very often.
filter
In my opinion, all modern homes should have solar panels. They're a characteristic of environmentally friendly houses.
feature
A lot of young adults that I know live at home with their parents. If they don't, they have to use a part of their income on rent. That can be expensive.
portion
I don't want to have a car or a garden. They both need a lot of work to keep them in good condition.
maintenance
In my town, there's a small group of factories close together, and the hot water that the factories produce is used to heat our houses. It's a great idea.
cluster
It's practical to have a good public transportation system in a city. It helps people travel around quickly and cheaply.
sensible
We have two separate containers for things we throw away. One is for recyclables. The other is for non-recyclables. It's a good way of organizing things.
system
Keeping something alive and not damaging it is not only an environmental necessity. It's also important for society and the economy.
sustainability
People generally move to my town for money and finance-related reasons. It's easy to find work, and the cost of living is not too high.
economic
Some cities use the money that they make from parking fees to improve the roads.
revenue
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