READING REVIEW:Review these excerpts from the passages in Unit 3. Then match the opinion to the person who expresses it. [table] Living on an Urban PlanetHarvard economist Edward Glaeser is one person who believes that cities bring largely positive benefits. According to Glaeser, cities are "the absence of space between people." This closeness reduces the cost of transporting goods, people, and ideas, and allows people to be more productive. Successful cities also attract and reward smart people with higher wages, and they enable people to learn from one another. According to Glaeser, a perfect example of how information can be shared in a big city is the trading floor of the New York Stock Exchange. There, employees share information in one open, crowded space. "Theyvalue knowledge over space," he says, "That's what the modern city is all about."Another champion of urbanization is environmentalist Stewart Brand. According to Brand, living in cities has a smaller impact on the environment than living in suburbs and rural areas. Cities allow half of the world's population to live on about 4 percent of the land. City roads, sewers, and power lines are shorter and require fewer resources to build and operate. City apartments require less energy to heat, cool, and light than houses in other areas. Most importantly, Brand points out that people living in dense cities drive less. They can walk to many destinations and use public transportation. As a result, cities tend to produce fewer greenhouse gas emissions per person than suburbs.Because of these reasons, it may be a mistake to see urbanization as evil. Instead, we should view it as an inevitable part of development, says David Satterthwaite of London's International Institute of Environment and Development. For Satterthwaite and other urban planners, rapid growth itself is not the real problem. The larger issue is how to manage the growth. [...] Urban planners around the world continue to struggle with the problem of how to manage urbanization. While they used to worry mainly about city density, urban planners today are focusing on urban sprawl - the way big cities are spreading out and taking over more and more land.Shlomo Angel is an urban planning professor at New York University and Princeton University. He thinks rising incomes and cheaper transportation are two main reasons for urban sprawl. "When income rises, people have money to buy more space," he says. With cheaper transportation, people can afford to travel longer distances to work. In the second half of the 20th century, for example, many people in the United States moved from cities to suburban areas. This trend led to expanding suburbs, which led to more energy use and increased air pollution and greenhouse gas emissions.Today, many planners want to bring people back to downtown areas and make suburbs denser. Some ways to densify suburbs include creating walkable town centers, high rise apartment buildings, and more public transportation. This would make people less dependent on cars. "It would be a lot better for the planet," says Edward Glaeser, if people are "in dense cities built around the elevator rather than in sprawling areas built around the car." [/table][table] The Urban VisionaryWhen architect and urban planner Richard Wurman learned that the majority of Earth's population lived in cities, he became curious. He wondered what the effects of global urbanization will be. With a group of business and media partners, Wurman set out on a five-year study - a project called 19.20.21 - to collect information about urbanization, focusing on the world's largest urban concentrations, or megacities.Interviewer: What draws people to cities?Wurman: People flock to cities because of the possibilities for doing things that interest them. Those interests - and the economics that make them possible - are based on people living together. We really have turned into a world of cities. Cities cooperate with each other. Cities trade with each other. Cities are where you put museums, where you put universities, where you put the centers of government, the centers of corporations. The inventions, the discoveries, the music and art in our world all take place in these intense gatherings of individuals. [/table] Who compares modern cities to the work of people in the financial industry?