Cities in the face of climate change: Solutions for hot summers

Climate change is becoming increasingly noticeable in Bavarian cities. Residents are feeling the effects of rising temperatures, especially during the summer months. Researchers expect the number of days with temperatures above 25 degrees Celsius to double in the future. Cities are thus becoming veritable heat islands, where temperatures are significantly higher than in the surrounding countryside. These urban heat islands pose a growing challenge for city planners and residents.

The causes of urban heat

Several factors contribute to the urban heat island effect. Concrete and asphalt surfaces store heat and release it slowly, resulting in minimal cooling even at night. Traffic and other artificial heat sources also contribute to the warming. Furthermore, many urban areas lack sufficient green spaces that could have a cooling effect. Hofackerstraße in Augsburg, characterized by concrete buildings and parked cars, is a prime example and heats up considerably.

Trees as a natural air conditioner

An effective and proven method for cooling cities is planting trees. Trees not only provide shade but also cool the air through transpiration. A large tree can transpire between 60 and 80 cubic meters of water annually, leading to a significant temperature reduction. Healthy and well-watered trees are therefore essential for climate regulation in urban areas.

Problems and solutions in greening

Many urban trees are under stress because the ground around them is often too heavily sealed. This means that water cannot reach the roots, significantly limiting the trees' capacity to transpire. Urban planners like Andreas Hofmann from Augsburg are therefore focusing on unsealing surfaces and creating more green spaces. Munich's Rotkreuzplatz demonstrates how successful such measures can be: Here, 34 large trees ensure a more pleasant temperature compared to the surrounding streets.

Challenges and public acceptance

Transforming urban spaces towards more green areas and less paved surfaces is not always easy. Conflicts often arise regarding parking space use and other urban needs. Therefore, long-term, well-thought-out planning that involves residents is essential. In Augsburg, Hofackerstraße is being transformed into a so-called "climate street," although this project has also drawn criticism. Urban planners must therefore constantly find compromises to meet the diverse needs of citizens.

Conclusion

The fight against urban heat requires innovative and sustainable solutions. Greening cities and reducing soil sealing are key measures for improving the urban climate. This is not just a task for urban planners, but also requires the engagement and support of citizens. Only together can we make our cities more resilient to the challenges of climate change. Keeping heat out of people's homes is also an important step. For this, external heat protection for windows is recommended, such as the CLIP'N'SHADE external roller blind. https://clipnshade.de/shop/clipnshade-aussenrollo/

Further information and detailed data on climate change in cities can be found on the website of the German Meteorological Service. here .

Sources:

• Trümper, Arno. “Bavaria’s cities are getting hotter and hotter.” BR24, July 22, 2024.
• Focus No. 285, April 2020. “Accessible housing: Demand rises sharply due to aging population – funding works.” KfW Research.
• Workbook Trend Canvas, 2022. “Trend Glossary.”