Climate challenge: raising collective awareness in the tradition of games with a purpose

The Climate Challenge is an online competition in the tradition of games with a purpose that combines practical steps to reduce carbon footprint with predictive tasks to estimate future climate-related conditions. The application is designed to increase environmental literacy and motivate users to adopt more sustainable lifestyles. Its feedback channels include a leaderboard and a visual tool to compare answers of individual players with (i) the average assessments of their direct social network contacts as well as the entire pool of participants, (ii) a selected group of experts, and (iii) real-world observations.