In times of crisis, urgency and lack of data, decision-making may drift away from long-term sustainability. This paper presents a case study of product and process design decisions, and description of an instant green design event workshop (IGDE-workshop). While informed sustainability decisions at best use thorough life cycle assessments, these take a considerable time. Results show that it may be possible to make reasonable environmental design decisions fast in crisis situations with a design event focusing on green design and life cycle thinking. It requires a broad team with decision-making authority and with all available information at hand. The IGDE-workshop gave reasonable input for decision-making in crises regarding ecoefficiency and climate impact, although gaps in other impact categories not covered remains.