To change the pre-peak curve, first select the year in which emissions will reach their highest peak level. Then, decide whether you expect growth to slow as the peak approaches or continue apace until the peak. The difference between those two curve shapes is illustrated below:
Slowing increase: Accelerating increase:
Finally, set the pre-peak growth rate. For a slowing increase, this is the initial growth rate (the rate slows to zero by the peak). For an accelerating increase, this is a constant growth rate until the peak.
Finally, set the pre-peak growth rate. For a slowing increase, this is the initial growth rate (the rate slows to zero by the peak). For an accelerating increase, this is a constant growth rate until the peak.
For reference, historical annual growth rates of CO2 emissions are as follows:
2000-2004: 3.0%See Data Sources (emissions).1990-2000: 1.5%