Ben's Bunny Trouble is set in a near future in which the world has lost all its green space. When Ben decides that the city is not the best place for his bunnies, he embarks on an out-of-this-world journey to find them a better home. It takes a few false landings and help from a variety of aliens, but in the end, Ben finds his bunnies - which seem to have multiplied - a new place to live.
In Justine McKeen, Walk the Talk, the second book in the Justine McKeen series, Justine decides there are too many cars idling in front of her school. So she comes up with a solution that should help keep the air cleaner. But she soon discovers not many adults trust her crazy ideas.