Ph.D. Karmen Margeta, scientific advisor participated as an invited lecturer at the “Global Summit and Expo on Sustainable and Renewable Energy (GSESRE)” conference, which took place from June 16 – 18, 2022 in Copenhagen, Denmark. In the lecture entitled “Solving the Problem of Sustainability of Cities Worldwide with Integrated Seawater Steam Engine System”, an original solution for achieving the sustainability of cities based on innovative technology using renewable energy sources was presented. With the proposed solution, cities around the world can become completely sustainable, i.e. independent of external sources of energy and drinking water. As the moderator of the first day of the conference, she had the pleasure of opening the GSESRE conference, which was attended by scientists from more than 25 countries around the world who presented new achievements and research results in the fields of sustainable and renewable energy.