The user has the choice of two curve shapes for the pre-peak curve, defined as follows:
1) Accelerating increase: Emissions continue to grow at the user-defined growth rate (g) until the user-defined peak year. The equation is: Emissions (t) = Emissions (t-1) *(1+g), where t is the year, and g is the growth rate
2) Slowing increase: Growth in emissions slows from the user-defined rate (g) in the current year to 0 in the user-defined peak year. The equation is: Emissions (t) = Emissions (current)*(1+g*(peak year – t)/peak year – current year), where t is the year and g is the initial growth rate.
Note, “current” year is defined as the latest year for which emissions data is available.