The Paris Framework Convention on Climate Change (UNFCCC) 1 was announced as a decisive step in the global response to the threat of climate change. The long-term goal of temperature is to keep the increase in global average temperature well below 2 degrees Celsius and to limit it to 1.5 degrees Celsius above pre-industrial levels. This climate objective is accompanied by a legally binding revision architecture in which countries submit national climate plans every five years (although commitments are not legally binding) 2,3. These nationally defined contributions cover aspects of mitigation and adaptation, as well as issues related to means of implementation (e.g. B capacity building, international financing and technology transfer), comparability and equity, or sometimes links to sustainable development4. Alternating with the NdC`s five-year bidding cycle, the parties to the Paris Agreement will carry out regular inventories of implementation progress. These inventories assess the common progress made in achieving the objectives of the agreement and the Paris Agreement expressly stresses that they are being carried out taking into account the best available scientific knowledge. Fifty-five countries, or enough to increase global emissions to 55%, were needed before the agreement could enter into force. J.R., M.M.
and K.R. designed the research. O.F. led the implementation and documentation of NDCs in IAM IIASA with contributions from J.J.J.Z. and all other authors. V.K. established the data for the assessment of ambiguities in the energy bill. J.R. analyzed the results of the modeling, directed the writing of the paper and created all the numbers.
All authors contributed to the discussion and interpretation of the results. In order to study the influence of the six dimensions of uncertainty listed in Table 1, a draft scenario was implemented, including all possible combinations between interpretations of the dimension of uncertainty. Figure 1 shows the draft scenario that leads to 144 unique interpretations of the NDC. The general modeling structure and approach are presented in Figure 5. The influence of a certain dimension of uncertainty is defined as the difference between the pairs of scenarios that are exactly the same in all but one dimension.