Question

heat islands and effects
the urban heat island effect can be caused by impervious surfaces (like concrete) and air conditioning units. which of these also causes the urban heat island effect?
increased vegetation
fuel combustion

Explanation:

Increased vegetation reduces urban heat islands by shading surfaces and evaporative cooling. Fuel combustion (from vehicles, industry, etc.) releases excess heat and greenhouse gases, which directly contributes to the urban heat island effect.

Answer:

Fuel combustion