SSP2-4.5
SSP2-4.5 is updated scenario from Representative Concentration Pathway (RCP 4.5) where projections follow historical pattern without significantly deviating from the historical pattern. In other words, current situation (business as usual) continue without any climate policies.
Sources
O’Neill, Brian C., Claudia Tebaldi, Detlef P. van Vuuren, Veronika Eyring, Pierre Friedlingstein, George Hurtt, Reto Knutti, et al. 2016. “The Scenario Model Intercomparison Project (ScenarioMIP) for CMIP6.” Geoscientific Model Development 9 (9): 3461–82. https://doi.org/10.5194/gmd-9-3461-2016.