Which option correctly describes the relationship between SSPs and RCPs in climate modeling?

• A. They are the same concept; both describe radiative forcing.
• B. SSPs are socio-economic scenarios; RCPs are radiative forcing trajectories; modern analyses combine them to link futures with forcings.
• C. SSPs are used only for historical climate data; RCPs are used only for policy decisions.
• D. SSPs are meteorological models; RCPs are agricultural models.

Answer: (B)

SSPs describe how society might evolve in the future—factors like population, economics, technology, energy systems, and governance that influence emissions, energy demand, and adaptation options. RCPs describe fixed radiative forcing trajectories resulting from greenhouse gases and other forcings, which climate models use to simulate how the climate responds. In current climate research, these are linked by pairing a socio-economic pathway with a climate forcing pathway, connecting a social future to a specific pattern of forcing and warming. That setup lets us explore how different ways society could develop lead to different climate outcomes. The other statements mix up what each term represents: they are not the same concept, they’re not limited to historical data, and they’re not simply meteorological or agricultural models.