When Bill Gates and Paul Allen founded Microsoft in 1975, they were living in Albuquerque, New Mexico. Back then, the city was already pretty hot; temperatures climbed to over 90 degrees Fahrenheit an average of 36 days a year. But by 2050, that number of days is expected to double. And by the end of the century, it will triple. The health and... See more

It is a question of when—not if—large and growing areas of countries become uninhabitable owing to prolonged freshwater shortages, extreme heat, widespread flooding, and frequent, costly storms. Bangladesh may well be the first country with a substantial population to face this problem on a large scale. The amount of land able to support human

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