This Spanish-language book is one in a series of four entertaining What Do You Know About? books, for very young children whose first language is Spanish. Attractive color illustrations and easy-to-follow text combine to present factual information that younger boys and girls will readily absorb and understand. Las tres erres, which is Spanish for “The Three Rs,” describes the ways in which kids and their families can avoid waste and be environmentally conscious. Four pages presenting activities for children appear at the back of the book, followed by a two-page section for parents, with tips on explaining the subject in more detail.