The ISI-MIP concept
ISI-MIP is a community-driven modelling effort with the goal of providing cross-sectoral global impact assessments, based on the Representative Concentration Pathways (RCPs) and Shared Socio-Economic Pathways (SSPs) scenarios.
Based on these common background scenarios, a quantitative estimate of impacts using policy-relevant and society-focused metrics, and uncertainties for different sectors and from multiple impact models will be derived.
Coordinated by a team at PIK, with support from IIASA and backing from the IPCC Working Groups II and III, the ISI-MIP Fast Track provided outcomes for the IPCC’s Fifth Assessment Report (AR5).
ISI-MIP aims to establish a longer-term coordinated impact assessment effort driven by the entire impact community, beginning with ISI-MIP2.
Studies of mitigation pathways and strategies show that limiting global warming to 2° is much more ambitious and costly than a 3°. However, little is known of the quantitative differences between impacts of different levels of global warming, not to mention how impacts in different may interact and potentially amplify one another.
In order to provide an estimate of the differential impacts of climate change, research is required to improve our fragmented knowledge and large uncertainties. A global, cross-sectoral, quantitative synthesis of climate impacts, including consistent estimates of uncertainties, is missing so far.
Furthermore, a better, quantitative understanding of impacts will enable the derivation of efficient impact emulators, which can in turn be employed to enhance integrated assessment studies.