It said «Scenario A assumes continued exponential trace gas growth, scenario B assumes a reduced linear linear (sic) growth of trace gases, and scenario C assumes a rapid curtailment of trace gas emissions such that the net climate forcing ceases to increase after the year 2000» (realclimate.org)
Scenario «C» [chart's cyan curve] drastically reduces trace gas growth between 1990 and 2000 such that the greenhouse climate forcing ceases to increase after 2000.» (c3headlines.com)
Trace Gases We define three trace gas scenarios to provide an indication of how the predicted climate trend depends upon trace gas growth rates. (climateaudit.org)