How can you be kind to Earth? Young readers learn all about pollution and how to protect earth with Big Bird and his Sesame Street friends. Keep water clean, pick up litter, and recycle to help stop pollution.. This fun series provides the perfect introduction to environmental awareness. From conserving energy and water or fighting litter and pollution to the history of Earth Day, each book offers simple ways to care for the earth, with fun asides and commentary from your friends on Sesame Street. Interior paper made with 30 percent recycled post-consumer waste fibers.