Berlin is experiencing an unusual threat – a large-scale infestation of the *Lymantria dispar* moth, numbering around 600,000 larvae. This outbreak is directly linked to climate change, as warmer temperatures have facilitated the moth’s proliferation. The caterpillars are causing significant damage to the city’s trees, weakening them and making them more vulnerable to future heatwaves. City officials are preparing for anticipated extreme heat events, recognizing the compromised state of the urban forest. The situation highlights how climate change impacts are becoming increasingly visible and tangible in urban environments, moving beyond abstract concerns. Residents are being advised to be cautious, as the caterpillars pose a nuisance and contribute to tree decline. The infestation underscores the need for proactive urban forestry management in the face of a changing climate.