The Project involves creating an interactive online platform to present key features on macroeconomic; climate and nature policies for many countries. The aim is to provide Ministries of Finance and their ecosystem (think tanks; Universities; observers; etc.); but also the general public that may visit the website hosting the platform; with an ergonomic tool to (i) visualize some key figures on macroeconomic; climate and nature characteristics specific to each country and (ii) access an easy-to-use interface to simulate the impacts of various transition pathways and financing options on aggregated socio-economic variables. The Platform would be an entry point for a better understanding of the macroeconomic and financial implications of various climate and nature transition pathways. This could be done through three different user experiences:- Some users might simply wish to visualize key aggregate data on climate; nature and macroeconomic variables and policies for a given country.- Some users may wish to simulate climate and nature policies in a country-specific context and assess the impact of these policies on climate and nature targets; but also on key macroeconomic imbalances.- Some users may be interested in delving deeper into the assessment of transition pathways and transition scenarios. The Platform will provide useful data and simulation for three purposes: visualizing key data for the transition in an easy-to-read way; understanding the strengths and weaknesses of simple transition scenarios; and contributing to the decision-making when appropriate.