On Green Day, Cam and her classmates discuss ways to protect the environment, but when money collected for the school's new skylights disappears, Cam uses her photographic memory to solve the mystery.

When Mallory is appointed to the Fern Falls Elementary School Environmental Committee, which is deciding on class projects for the upcoming Green Fair, she rapidly succeeds in alienating her classmates, friends, and family by her overzealous efforts to save the planet.

New third grade teacher Mr. Granite has so many strange ideas about how to make Ella Mentary School environmentally friendly that the students are sure he must be an alien.

A class field trip to Camp Go Green inspires Hope Roberts to take up environmental causes, but getting busy grown-ups (or her older sister) to pay attention to a middle schooler can be something of a problem, and so is Hope's expectation that everyone will share her enthusiasm; her science club gets her school to add more recycling bins, start a carpooling program and create a garden, but it turns out that saving the world is more complicated than...

Rather than a summer of fun transforming her family's pharmacy into an eco-spa, Lucy Desberg must face her sister Claudia's new boyfriend Bean, investor Gary's irritating daughter Bevin, and a spa coordinator who is put in charge of the plans.

Nancy, George, and Bess win a vacation at an eco-resort in Costa Rica but they find out soon enough that Casa Verde is not as green as it seems and there is definitely something suspicious lurking behind the beautiful landscape.