They can do a lot of actions. Specifically, they can do two sort of things. The first kind is analyse their behaviour after they certainly find something to improve their local environment. The second kind is to find the environmental group.
Their behaviour can analyse according to four aspects. Things they buy. Things they use. Things they throw. Which are transport they use. If they buy things without plastic, things made near your home… If they use the thing without abuse, without produce a lot pollution, … If they classify the trash, they reuse the things … If they use the public transport, the bike, … They will improve their local environment.
Normally, if they read the local newspaper, they will find news about the local environment or the actions of the environmental groups. If they join an environmental group, they will help protect, regenerate or clean the environment. And when there are alarm, they can help the group complain.
In my opinion, today's world it is very important for us to respect the environment and we should fight to help protect the environment.