The OECD Working Party on Chemical Accidents (WPCA) organised a half-day thematic session at the occasion of its 32nd meeting on 26th October 2022. This thematic session covered two themes: How to make lessons from accidents work? and Challenges and issues arising from decarbonisation and the energy transition. The thematic session was organised as a brainstorming meeting with presentations from experts and discussion to exchange on challenges in these two particular areas. This report summarises the main conclusions from the thematic session.