However, as cities are increasingly designed to accommodate cars instead of people, sedentary lifestyles have become common and health issues proliferate. For example, the early 20th century invention of the automobile has addressed some of the difficulties associated with long commutes. Innovations have generally addressed the challenges posed by rising populations, only to be replaced by new hurdles. China’s cities alone will be home to a staggering 900 million people.Īlthough cities may appear to be in a state of continuous expansion, their population growth has historically occurred in cycles. By 2050, that number is expected to reach 68 percent, which means an additional 2.5 billion people will reside in urban areas. According to the United Nations, 55 percent of the global population currently lives in cities. The world faces unprecedented rates of urban expansion.
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