An emission management system is implemented via a host server that is accessible to a large number of clients (organizations) using a website. Based on data input by a client relating to actual usage of resources, the client's past CO2e emission over time is calculated by the host server and displayed to the client on the website in the form of a wedge chart, with emissions along the y-axis and time along the x-axis. The server software also extrapolates the past emissions to display baseline predicted future emissions, assuming no reduction strategies are implemented. The client also inputs an emission target level and proposes one or more strategies for reducing the baseline level to achieve the target level. The server converts each strategy to a CO2e emission reduction and layers the different reductions between the baseline level and the target so the client can graphically see the effect of each strategy on achieving the target.