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This year, CVSan developed a Kahoot! Path to Zero Waste sorting game, which students and teachers loved. Two classrooms with the highest scores were rewarded with “Little Miss Reduce” reusable water bottles. Congratulations to Mrs. Kinser’s third grade class and Mrs. Evan’s fourth grade class for having the highest scores among the 43 classes that attended the field trip. 4Rs (Reduce, Reuse, Recycle, and Rot) Field Trips are typically offered to third grade classes and cover the topics of zero waste, sorting what goes where, and climate change. 4Rs Field Trips were suspended during the 2020/21 school year because of COVID-19 but was brought back for the 2021/22 school year and offered virtually via Zoom in a condensed 30-minute presentation. Fourth grade classes that missed it last year were also invited to attend 4Rs Field Trips this year. CVSan has hosted 4Rs Field Trips for Castro Valley schools since 1997. Over the last 16 years, 437 Castro Valley classes have participated. The field trip provides students with an introduction to sustainability and zero waste education and engages them in exercises to learn about waste reduction, material composition, reuse and recycling, composting, green design, and Bay-Friendly Landscaping. In a fun 4Rs dance during the field trip, students learn scientific concepts with movement. Students make recycled paper from paper, and are given a tour of the CVSan office, a green building, as well as the corporation yard and Bay-Friendly landscape. 4Rs Field Trips are an important component of CVSan’s Green Ribbon Schools Program. For more information on CVSan School Programs, please visit In the photo : Mrs. Evan’s 4th Grade class of students, with their Little Miss Reduce water bottles, at Proctor Elementary School.