Hansen’s 1988 definition, which has been deleted from the GISS website and blocked from the web archive
Scenario A assumes continued exponential trace gas growth, scenario B assumes a reduced linear 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.
So what has actually happened since 1988? Definitely not scenario C. Definitely not scenario B.
Hansen referred to Scenario A as the Business As Usual scenario.
It astonishes me that people are still trying to play the scenario B shell game.