The article discusses how sustainable cities like Copenhagen are designed to meet the needs of people while protecting the environment. It looks at innovative solutions used in Copenhagen to achieve city sustainability, focusing on environmental protection. A comparison with other European capitals shows Copenhagen's progress in meeting the goal of Sustainable Cities and Communities. The research aims to determine if Copenhagen is a sustainable city and how such cities help achieve sustainable development goals. The findings suggest that Copenhagen has made significant strides towards sustainability, offering valuable lessons for other cities to follow.