The twin crises of climate breakdown and biodiversity loss are the most serious issues of our time. The built environment accounts for significant energy and material related carbon dioxide (CO2) emissions whilst also having a significant impact on our natural habitats and personal wellbeing. For everyone working in the construction industry, meeting the needs of our society without breaching the earth’s ecological boundaries will demand a paradigm shift in our behaviour. Together with our clients, we will need to commission and design buildings, cities and infrastructures as indivisible components of a larger, constantly regenerating and self-sustaining system. The research and technology exist for us to begin that transformation now, but what has been lacking is collective will. Recognising this, we are committing to strengthen our working practices to create architecture and urbanism that has a more positive impact on the world around us.