Individuals are now often presented information about greenhouse gases in their everydaylife. However, there seems to be a gap between this increase in the exposure to carbondioxide information and the understanding of how to interpret it, making behavioral changedifficult. This article presents examples of how different applications have dealt with thisproblem by representing the carbon dioxide information in different ways. Based on theexisting examples, an application called carbon.to was developed and released. This servicetries to improve the understanding of carbon dioxide information by simulation in a playfulway. Feedback from the users points towards that the gap in understanding existed and thatcarbon.to was successful in helping closing it.