Book excerpt: You want to change the world. You want your work to have meaning. Maybe you're even audacious enough to want saving the world to be fun. What if saving the Earth were a game? Not just any game, but the greatest game we've ever played. This workbook helps social and environmental change professionals learn how to implement powerful techniques from the fields of game design, behavioral psychology, design, data science, and storytelling, that are not only proven to have impact, but also can make your project fun. In a 10-step framework of exercises, tutorials, and case studies, How to Save the World will teach you the art of changing the world - and it's often not what you think. Did you know that just by putting a sign above a recycling bin that showed people the number of cans inside increased the recycling rate by 67 percent? Or when people standing in line at a cafe were told that other customers before them had ordered a vegetarian meal, that this simple intervention doubled the total rate of vegetarian meal orders? As you implement these academically researched and measurement-driven techniques, How to Save the World will drive you to dig into your creativity and unearth your greatest ideas that shift the numbers on the causes you most care about, so you can experience the joy and satisfaction of seeing your work really, actually change the world every single day.