Una empresa noruega crea una app para competir con tus amigos y ver quién genera menos CO2 en su día a día

http://gemini.no/en/2015/11/check-your-climate-impact/

It doesn't need to be so difficult to cut your individual carbon footprint. The new app called Ducky will help make the effects of your choices on your carbon footprint visible. Photo: Ducky Ducky is an app designed to motivate individuals and businesses to change their environmental habits, and to reveal the effects of their actions in everyday life.