The $/tCO2e remains the industry's standard approach to calculating the efficiency of dollars spent on carbon reduction, as investments are made at a site level. Therefore we have chosen to maintain this approach. These calculations are also done according to the lifetime savings approach, meaning they account for the tCO2e saved over the lifetime of the investment. We calculate this by multiplying the annual savings by 8.75 for energy efficiency projects and 15.2 for energy source projects. This accounts for the average 10- and 15-year lifespan of these projects respectively