The Atmosphere and Climate Competence Center (ACCC; https://www.acccflagship.fi) organises the 5th ACCC Impact Week, which will take place in a hybrid mode during 14–17 April 2026 at the Sofia Cultural Centre in Vuosaari, Helsinki, Finland. ACCC invites researchers, companies, non-governmental organizations, decision-makers, education professionals, experts in research infrastructures, as well as ACCC members to join discussions on pathways to climate neutrality. This year’s theme focuses on the challenges of climate change from the perspectives of civil society, decision-makers, and the necessary funding. This event is organized by the constituting organizations of ACCC: Institute for Atmospheric and Earth System Research (INAR)/University of Helsinki, Finnish Meteorological Institute, Tampere University and University of Eastern Finland. The aim of the event is to further develop existing and new forms of collaboration with ACCC’s key stakeholders. We will work together to develop practical solutions and reliable roadmaps toward carbon neutrality, a safe climate, and clean air.

• We will present ACCC’s latest research results related to interactions between the biosphere and the atmosphere, with a particular focus on carbon sinks and carbon stocks in forests, peatlands, agricultural lands, and urban environments, as well as urban air quality.
• We will discuss carbon sink monitoring systems and sustainable land use and hear from leading experts in the field.
• We will discuss climate expertise, societal impact, and policy measures to combat climate change.
• This year, we are honored to welcome the Climate Theatre to perform for us on 14 and 15 April 2026! The program includes a unique and thought-provoking performance, with dinner served during the intermission. In the second half, well-known panelists such as Mari Pantsar, Saara Kankaanrinta, Risto Isomäki and Tuuli Kaskinen will also join the discussion. (Note: different panelists each night, shows are in Finnish)

Please, see the preliminary agenda and detailed programme at the end of this message and more detailed session descriptions from the Impact Week 2026 flyer. Note that on 14 April, the session for the PEEX hybrid seminar will be arranged in the first part of the day. Sessions are held in the same language as their titles, some in Finnish, some in English. For onsite participants, we will arrange bus transportation after the theatre on 14^th and 15^th to Rastila metro station and Helsinki Central Railway Station. If you wish, you may also stay overnight at Sofia at your own expense. Please, sign up latest on 7 April 2026 Register at: https://elomake.helsinki.fi/lomakkeet/138870/lomake.html Tentative agenda and more information is available: https://www.acccflagship.fi/index.php/5th-accc-impact-week-2026 More information about the Cultural Centre and Conference Hotel Sofia: https://www.sofia.fi/ For questions, please, contact: acccflagship@helsinki.fi