On 12 June 2025, the working group of the Deep Dive “Heat in the City” gathered online to wrap up their two years long collaboration on the topic of heat islands in the cities. Each city presented their pilot projects in depth to an audience of experts from Germany and the Global South.

The format

The Deep Dive format enables medium-term, intensive collaboration among a small group of municipalities over two years to develop concrete urban solutions through expert exchange and co-creation. Learn more about the format here.

Deep Dive “Heat in the city”

In this first edition of Connective Cities Deep Dive, the cities of Aswan (Egypt), Heidelberg (Germany), Lüdenscheid (Germany), Lviv (Ukraine), Nairobi (Kenya) and Mombasa (Kenya) worked together online and in person, in order to understand their respective challenges, exchange ideas, and scientific procedures. The group was supported by Potsdam Institute for Climate Impact Research (PIK) in the assessment of urban heat islands (UHI) in the city and development of locally-adapted solutions. Through the involvement of their local administrations, they implemented their pilot projects that incorporated procedural and organizational measures to mitigate heat in their cities. Learn more about each step of the Deep Dive here.

The six pilot projects

Each city piloted heat mitigation solutions tailored to their local contexts, focusing on data-driven, community-based, and cross-sectoral approaches. Nairobi planted shade fruit trees in schools and trained staff and students in thermal monitoring, while planning an open-access heat map for community awareness raising about the UHI. Lviv created pocket-parks and monitored their cooling effects, despite facing implementation challenges like martial law and funding gaps. In Lüdenscheid, a heat action plan was developed through interdepartmental collaboration, including initiatives like refill stations, awareness brochures, and a city cooling map. Aswan developed a comprehensive heat action framework using both local knowledge and international practices, selecting a pilot area for pedestrian-friendly, shaded public space transformation. Mombasa focused on stakeholder awareness and urban heat mapping, while Heidelberg introduced a high-precision urban climate analysis and a climate scanner to make urban planning more climate-friendly, better account for local microclimates, and thereby sustainably enhance quality of life and climate resilience. Learn more about the projects here.

Conclusions

All members of the working group agreed that the Deep Dive “Heat in the City” contributed with a broader impact in the six cities, not only by the development of climate mitigation strategies, but also in the perspective of tighter collaboration among local institutions and a strong feeling of global affiliation.

The municipal experts exchange has led to a stronger sense of community, co-creation, leadership skills, and ownership. As they explored how green activities could be linked to green jobs, international exchanges helped emphasize the urgency of finding solutions. These exchanges made decision-makers and the public more aware and underscored the need for immediate action.

The Deep Dive required a readjustment of their thinking and viewpoints, prompting them to reassess their own methods. They often had to justify working internationally while operations were still local, which helped them adopt a broader perspective on issues such as UHI. The exchange platform gave them also visibility and recognition, which in turn helped influence decision-makers. Despite challenging circumstances such as the war in Ukraine, people became more sensitised—highlighting that the right moment for action is now.

Finally, the working group noticed a growing sense of long-term awareness. There was a shift from seeking immediate results to focusing on long-term planning for resilience and achieving environmental goals. By learning from international successes and failures, they could improve the efficiency and effectiveness of our local processes.

Even if the Deep Dive has ended, the implemented projects are still ongoing and the six cities are better prepared to face heat waves now.

For more information, please contact:

Sibylle Loyeau, Sibylle.loxeau(at)engagement-global.de

Dr. Ing. Muna Shalan, muna.shalan(at)giz.de