This document discusses Earth Day and sustainable development. It proposes an activity for students to become "Energy Superheroes" by identifying and eliminating "energy killers" - things that waste electricity, water, or heat - in their school. Students would form groups and place colored post-its near energy killers. They would try to find and implement solutions, measure savings, and create posters documenting their work. The goal is to transition society toward more environmentally friendly practices.