Applying game design principles to environmental change projects can lead to powerful results. Game designers practice the art of engaging players and getting them motivated and intensely focused on achieving a goal. Here is a free chapter of the audiobook version of my book, How to Save the World on game design. It's the largest chapter in my book and dives into how to apply twelve different gamification techniques to environmental programs as well as the evidence of how these techniques have succeeded in creating pro-environmental change. 
Get the full audiobook from Audible https://adbl.co/32HrO2D
Or the digital package PDF + MP3 files https://katiepatrick.gumroad.com/l/NTLXy