Although each country is required to participate in the global inventory, the exercise does not assess whether the actions taken by a single country are appropriate or not. It will only assess the „collective“ efforts of the world. This is because measures to combat climate change must be „determined at the national level“ and that nations find it difficult to be told by others what to do. The inventory will not focus on who should do how much, but rather on what needs to be done. We describe a systematic review of the state of knowledge on issues relevant to the success of the overall inventory of the Paris Agreement, including the thematic leeway of the GST provided for by the Paris Agreement and Katowice`s decision in 2018. Phase 1 includes the collection and preparation of the information needed to carry out the inventory. The information comes from different sources. In addition to the national contributions (NDCs) of the parties and related reports presented under the Paris Agreement, the most recent scientific findings of the Intergovernmental Panel on Climate Change (IPCC) as well as contributions from non-governmental stakeholders and observer organisations will also be used.  The information collected is made public and collected in the form of summary reports. In addition, individual reports are prepared on various priority themes – mitigation, adaptation and (financial) support – and on issues such as the status of global greenhouse gas emissions, the overall contribution of NDCs and the status of adaptation measures to climate change.
 Decisions made last year omitted the details that need to be addressed to make the process effective. Beyond the approximate 2022 to 2023 timetable for the world`s first review, it is important to clarify how information is prepared and to ensure that it is made available at an appropriate time and that the results of the assessment are fully communicated to each country`s policy makers. The third phase must be completed in a timely manner to influence national policies for the development of the later NDCs, which expire in 2025. The outcome of the collective evaluation – perhaps a summary report – should also be defined. Countries have agreed on the global inventory process. The global inventory will be carried out in three phases: as part of the Paris Agreement, the world`s first inventory will be completed in 2023. It will check whether the net result of the measures taken to combat climate change was in line with the objective of limiting the rise in the average global temperature to 2 degrees Celsius, against pre-industrial periods. The inventory will help the world determine whether it needs to do more – and how much more. As a key element of the Paris Agreement`s ambition mechanism, countries will participate every five years in the global inventory to assess the common progress countries have made in achieving the long-term goals of the agreement.
This inventory process aims to inform the next round of NDCs in order to increase their ambitions; it also provides an opportunity to assess the need for stronger action and support. Learn more about the global inventory in this video hosted by Christiana Figueres. But most questions remain unanswered, creating uncertainty about the success of the global inventory. Unspecified issues include countries to emerge from the state with a thorough diagnosis and a range of options to improve the health of collective and individual measures to combat climate change. Transparency, analysis and accountability should encourage countries to accelerate and strengthen their action on climate change and to put the world on track to avoid a life-threatening increase in temperature. In Katowice, countries agreed on three phases of the global inventory: at last year`s COP24 in Katowice, Poland, countries agreed to meet mitigation, adaptation and financing targets, including to meet reduction, adaptation and financing targets.