At the CHE-VERIFY Joint General Assembly, Dominik Brunner (Empa) introduces the progress and plans for the CHE WP2. WP2 (Coordinating Efforts on Library of simulations for emissions and atmospheric transport) will generate a library of realistic CO2 simulations for present-day and future emission scenarios, “nature runs”, from the global to the regional scale to serve as input for other WPs. In a wider framework, they will also support the assessment of the requirements for a future space mission and the challenges introduced by the issues listed above. The model simulations will be based on current and future emission scenarios and cover a range of scales, from 1 km for a regional domain to 10 km for a global domain. In addition, specific simulations for point sources at sub-kilometre scale will be provided.