For encourage-
this is just an idea-
you protect the things you love.when we get our children  to love and enjoy the beauty of nature,the trees,the rivers,lakes,the mountains,the sea,animals and all other living things ,they will feel more protective of nature.
so as a leader u need to expose you student to the beauty of nature .when was the last trip since they took them to a river,a waterfall ,or the seaside .have they ever seen insects or animals in their natural environment as post to just in the zoo. have they watch some of these amazing documentaries about nature
here is an idea of the nature.  
  • Brainly User
If we make children realize about the importance of trees in our life,then they are automatically are encouraged to take care of tree.