As the climate changes, so do different aspects of life. Both in Germany and in South Korea, the average temperatures have increased significantly over the past one hundred years.Dry summers and mild,wet winters are no longer an exception.In addition,changes in the length and duration of the seasons occur in general. Furthermore, both countries face an increasing number of weather extremes with a considerable increase in the risk of disasters and destruction. In this context, urban areas in particular are a driving factor in climate change, as they contribute to global warming through increasing settlement, mechanization and anthropogenic heat production (crowds, industry, traffic, etc.). Therefore, urban areas catalyze the impact of climate change, which is already dramatic. Developing urban areas in a climate-friendly way, in terms of construction, infrastructure and social measures, thus has a major role in the fight against climate change. Finally, adequate measures are intended to counteract also the challenges of human health. And climate-related heat accumulation in urban areas is one of the most important challenges. In this context, the present discussion paper addresses the impact of increasing heat in urban areas.Along with identifying the reasons for the problem, the aim of this paper is to discuss the consequences as well as possible solutions. Both countries already have good approaches in the battle against heat development in urban areas and its associated consequences.However,the potential for improvement is still quite high.As a result of this discussion, recommendations regarding a sustainable urban development will be formulated.