Zebo and the Dirty PlanetBook - 1991
Zebo is a friendly, caring little man from another, cleaner planet. When he arrives on our polluted Earth one day and collects endangered animals, Amy and Andrew stow away on his spaceship to investigate. They return soon with a message of hope for the children on planet Earth: we can set things right, if we want to very much.
The sentences are short and simple. The plot can be enjoyed as a fantastical tale, or an adventure leading to early primary level discussion of topics like littering and taking responsibility.