“The air” is big, and warming affects winds which move the air elsewhere. I would also mention the ground (very big, planet-sized) as a heat sink, but in citie

“The air” is big, and warming affects winds which move the air elsewhere. I would also mention the ground (very big, planet-sized) as a heat sink, but in cities where it’s all covered with concrete and pavement it does reflect a lot of heat back which is one reason why we observe cities hotter than the country otherwise would be