This chapter introduces the concept of change over time. Teachers uses the following anticipatory set to focus attention and engage learners: introduce the title of the unit; they need to show students a small bag of clean, safe garbage; give students several minutes to talk to a partner about their ideas; and they need to ask for a few volunteers to share their thoughts. Teachers need to inform students that they will take a short preassessment designed to determine what they already know about reducing, reusing, recycling, and reimagining waste. They invite students to sit around the butcher paper and collaboratively draw a mural of the most beautiful city park or outdoor green space they can possibly imagine. As soon as the mural is finished, teachers need to ask students to help them attach the butcher paper mural to the wall using tape. Teachers need to ask students to describe how this makes them feel.