1. A method for evaluating greenhouse gas (GHG) emissions by an entity comprising: a. receiving a transmission from the entity conveying information regarding the entity's usage of various types of resources for past times; b. receiving a transmission from the entity conveying one or more strategies proposed by the entity for reducing future GHG emissions, each strategy having a start time and each strategy relating to the entity's future possible usages of the various types of resources; c. processing the information, using a programmed processing system, from steps a and b to derive past GHG emissions by the entity, a baseline level of future GHG emissions extrapolated from the past GHG emissions, and estimated future GHG emissions by the entity for each strategy; d. converting, using the programmed processing system, the derived past GHG emissions, the baseline level, and estimated future GHG emissions into a chart for viewing by the entity, the chart comprising: a horizontal axis indicating past times and future times; a vertical axis indicating amounts of GHG emissions; a first portion bounded by the horizontal axis and vertical axis identifying total GHG emissions along the horizontal axis based on the information provided by the entity in step a; and a second portion bounded by the horizontal axis and the vertical axis identifying estimated future GHG emissions along the horizontal axis based on information provided by the entity in step b, the second portion indicating: the baseline level of GHG emissions for future times, extrapolated from the information provided by the entity from step a, had no strategies been implemented by the entity to reduce GHG emissions; reductions of the baseline level of GHG emissions due to implementation of each strategy identified in step b, wherein each strategy is represented as a separate layer between the baseline level and a resulting estimated GHG emission level due to implementation of the one or more strategies identified in step b; and e. transmitting the chart to allow evaluation of the effect of each strategy on the estimated future GHG emissions.