4654
rooftops normally absorb the hot sun and heat up the air in cities which can make pollution worse .
 cities, rooftops, the hot sun
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 cities, rooftops, the hot sun