This document discusses the challenges of achieving sustainable urban regeneration in European cities. It outlines three main challenges - environmental issues like climate change and resource use, social issues like inequality and health, and institutional issues regarding governance and disparities. Regarding environmental challenges, cities need to reduce their carbon emissions, pollution, and impacts on the climate while improving quality of life. Social challenges include dealing with rising inequalities and helping vulnerable groups cope with environmental changes. Institutionally, cities must involve stakeholders like residents in regeneration and resolve conflicts between different interests. The document examines examples of how European cities have addressed these challenges through environmentally-focused actions and interventions. It argues sustainable regeneration requires addressing environmental, social, economic and institutional dimensions simultaneously.