Air condition, many houses are installed with them and few are not switching them on now, in the scorching weather lately.
Although the environmentalist have been calling out to the whole world to cut down the CO2 emission, not many response to their calls due to the scorching weather and habits. Many people knows that switching on the air conditioner is not very environmental friendly as they uses high amount of electricity and releases harmful gases as well.
However, the reason why these people continue using air conditional is because of habits, routine and dependent on them. Some children are growing in the environment whereby air conditioner is always there for them. Hence, it becomes an expensive habit and they are not used to places whereby there's no air-conditioner.
For routine, teens, espcially poly and university, are slowly getting used to the routine that their lecture rooms/halls are equipped with air-conditioner. Hence, it becomes a norm/part of life for them to be surrounded by the comforts of air-conditioners. 
Since children and teens have been growing in environment in air-conditioners, eventually, it becomes a habit. Thus, asking them to use fan and you will see their reaction like this" What the shell?! Are you kidding me?!"
It's true that we can get the cooling sensation now from the air conditioner, but in the long run, the weather will get even hotter and our future generation is going to suffer because of our expensive habits.
Thus, think before using air conditioner; Save the earth, reduce suffering for the future generations, use FANS.