Ricardo Garay 
Little Guardians Series — Forest Protection 

This series of little alien guardians of nature that come out of your planet in pursuit of the biggest polluter of the universe, the wicked Zirt Zlunder. He escapes and comes to stop on Earth. In this book Zirt Zlunder decides to destroy the forests by devastating and burning trees, scaring the animals. The Little Guardians have located Zirt Zlunder and will prevent him from destroying the forests, after all, they now have two new companions, Floy and Fauy. Can they do it? They will be able to arrest Zirt Zlunder the terrible polluter?