In cities with hotter climates, air conditioning units in every window are a sign of a rising middle class. But mounting temperatures have also made air conditioning in developing countries a necessity for urban survival. We wonder: Which of the following statements about the global rise of air conditioning are true?
A. India will soon see more air conditioners installed than any other country.
B. AC units add significant electricity demands.
C. Air conditioners can be made at least 25% more efficient.
D. Air conditioning coolants need to be replaced to slow global warming.