What effect did the black triangle have on the black forest?

The Black Triangle, an area where the borders of Germany, Poland, and the Czech Republic meet, was heavily impacted by industrial pollution during the late 20th century. This pollution led to significant environmental degradation in the Black Forest, causing acid rain that damaged forests, soil, and waterways. As a result, biodiversity declined, and many tree species suffered from stress or death. Efforts to reduce emissions and restore the environment have since improved conditions, but the legacy of pollution remains a concern.