There are four RCPs defined by the IPCC, namely RCP 2.6, 4.5, 6.0 and 8.5. The numbers refer to the W/m^2 forcing generated by the extra CO2 according to the following formula.
ΔF = 5.35 x ln C/C0 W/m^2
where C is the CO2 concentration in parts per million by volume and C0 is the reference concentration. The relationship between CO2 and radiative forcing is a logarithmic one, at concentrations up to several times the current value, and thus increased concentrations have a progressively smaller warming effect.
Not sure what you mean by the Dutch RCP, can you elaborate? RCP8.5 is often referred to as the business as usual scenario and to all.intents and purposes is an impossible scenario. However alarmists love to.use it to scare the horses, as witnessed by the last National Climate Assessment 2018 which was largely based around that.
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