The stated policies scenario (STEPS) is used as the IEA scenario which is closest to the NDC scenario. For the NGFS scenarios, the average of the three main models is displayed. By contrast, the second NGFS scenario, referred to as “nationally determined contributions” (NDCs), assumes that only currently pledged climate change policies are implemented.
This means that global efforts would be insufficient to halt significant global warming. Emissions would decline but lead nonetheless to at least 2.6 °C of warming associated with severe physical risks, setting the world on a  “hothouse” path and failing to meet the climate goals of the Paris Agreement.