The enclosed is a description of a computer-implemented method for aggregation of carbon emission data. A server receives data entries recording user actions from an application of a client device. The server assigns each data entry to one or more communities of the application. The user actions recorded are converted by the server to carbon emission equivalents. The carbon emission equivalents of a community to which a particular user belongs are aggregated for the particular user. The server establishes a data stream with the client device of the particular user and transmits the carbon emission equivalents of the community and a totality of carbon emission equivalents of the application to the client device. The carbon emission equivalents of the community and the totality of carbon emission equivalents, including communities the user is excluded from, are displayed on the client device on a master dashboard of the application.