it is a dreamy vision of someone expecting a fresh and clean environment to be lived in.
Earth is surrounded with polution and waste all around and our character (sos) sleeps and dreams of a place better than earth. he plays, runs and enjoys this new place: the moon, filled with water, flower, mountains [life!] but then reality hits hard when he wakes up. this reminds him of earth and how worst it can get if we dont act now.

in reality, there is no better place than earth!