This document outlines three lessons for getting school-wide buy-in for sustainability efforts from Rick Swanson of Hingham High School. The first lesson is to plan engaging educational events like teach-ins, science fairs, films, and speaker events to generate 100% participation and positive press. The second lesson is to spark competition and school spirit around sustainability goals through challenges between classes or sports teams with prizes for the champions. The third lesson is to declare a "Green Week" with activities like building raised gardens, promoting carpooling, giving away t-shirts, and rewarding the greenest cafeteria table to incentivize green behavior through fun and recognition.