Marilu, Cipi, Tino, and Nemo form a group called "Natura Pulita" or "Clean Nature" to address environmental issues they see around them. Marilu notes the air is hard to breathe, Cipi has a bad cough, and Nemo has a stomach ache. Tino points out that grass can no longer be distinguished from trash. The group aims to save the sky, land, and sea through their environmental education and cleanup efforts.