Keywan Riahi

TL;DR: In this article, the authors provide the background to and process of developing the conceptual framework for these scenarios, as described in the three subsequent papers in this special issue (Van Vuuren et al., 2013; O'Neill et al, 2013; Kriegler et al. 2013).

TL;DR: It is shown that implementation of current policies leaves a median emission gap of 22.4 to 28.2 GtCO 2 eq by 2030 with the optimal pathways to implement the well below 2 °C and 1.5‬C Paris goals, which shows that all countries would need to accelerate the implementation of policies for renewable technologies, while efficiency improvements are especially important in emerging countries and fossil-fuel-dependent countries.

TL;DR: It is concluded that the SSP–RCP scenario framework has been widely adopted across research communities and is largely meeting immediate needs, however, some mixed successes and a changing policy and research landscape present key challenges.

TL;DR: In this paper, the authors present a range of its outcomes by synthesizing results from the participating global coupled Earth system models for concentration driven simulations, focusing mainly on the analysis of strictly geophysical outcomes: mainly global averages and spatial patterns of change for surface air temperature and precipitation.