HI is most noticeable during the summer and winter. The main cause of the urban heat island effect is from the modification of land surfaces. Waste heat generated by energy usage is a secondary contributor. As a population center grows, it tends to expand its area and increase its average temperature.
I don’t know maybe you should figure it out yourself, it’s a short story. I’m sure that you're capable of reading a short story.
I gotta say that is a true statement