It's hard to imagine a modern world without air conditioning. There would be no refrigerators to store food, so grocery shopping almost every day would become necessary. An icebox would only keep food good for 2-3 days, so there would always be a higher risk of food poisoning. Skyscrapers would certainly not be very comfortable places in which to work. Many people living in hotter climates like Phoenix, Arizona would not be able to stand the 100-degree heat and probably would have to move up north, at least during the summer months.
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