Question

what can reduce the urban heat island effect? additional air conditioning units rooftops covered with plants

Explanation:

Plants on rooftops (green roofs) can absorb less heat compared to traditional rooftops. They also release water vapor through transpiration, which cools the surrounding air. Additional air - conditioning units, on the other hand, release heat as a by - product (from their compressors and condensers), which would contribute to the urban heat island effect.

Answer:

Rooftops covered with plants.