Inverted pyramid [By Jiao Haiyang/China.org.cn]

Behold the Americanization of China: fast food, plentiful portions, obesity and SUVs that eat up a whole hutong's pathway. Across several dimensions of society, the Middle Kingdom is hurtling toward the American standard—the good life promised to Chinese people by American films and television series.

However, it is plainly not sustainable. China is a country of 1.3 billion, and it must take the European path, bypassing the American consumer model of conspicuous consumption and unabashed gluttony. This won't be easy. Extraordinary though the last 30-plus years have been, China's wealthy has set an unrealistic example of the good life: a spacious urban apartment with an automobile and a parking space. Why is it unrealistic?

China's middle class, not yet 100 million, is predicted to increase to 700 million by the end of this decade. Let me not rest upon statistics and projections, certainly not in an enormous country like China. Instead, look to greater Asian society as a guide. Chinese academics have already identified several problems. For instance, Zhou Xiaohong, Dean of Social Science School of Nanjing University, said the middle classes in East Asian countries such as China and Japan cannot live like those in the United States, apparently because of the high populations and limited arable land.

Short reflection confirms this. Japan's densely populated society has accepted cramped living quarters and warmed to planet-friendly living. But this will be a tougher sell in China, where optimism thrives despite society's rocky adjustment to rapid change. In this race for wealth, several speed bumps must be heeded.

First, China's demographic problem is already grievous, especially its aging population and its medical and social needs. The 4-2-1 pattern of grandparents, parents and a single grandchild puts enormous pressure on the youngest generation to provide care for the old, while at the same time saving for the costs of marriage and child-care. China, despite its transformations, retains a traditional value system that typically looks to men to bear these costs. Potential wives, however, might not be entirely patient and understanding. An expectations-gap might arise, and China could witness declining marriage rates like those in Japan and South Korea.

Additionally, rising obesity will further threaten China's nascent social safety net. Obesity affects the young in particular, with over one third of boys overweight or obese. Contrary to trends in Western countries including the United States, obesity in China is positively correlated with wealth, bringing concerns that rising incomes might send obesity-related diseases soaring. As in the United States, ordering sumptuous plates of steak and buttered lobster might signal a certain social status, but it can lead to health and sustainability externalities that China can hardly afford.

From clogged arteries I now turn to clogged roads. As residents of most first-tier and second-tier cities know, China's urban infrastructure simply cannot fit as many automobiles as the urban wealthy would like. First, consider emissions. China's per-capita carbon footprint may exceed America's as early as 2017. Even rather modest GHG reduction targets cannot be met if every Chinese who can buy a car does buy one. China should instead look into some European countries' plans to make urban areas pedestrian-friendly, if not explicitly car-unfriendly.

Finally, highway construction outside of cities can be environmentally and socially disruptive in a country like China, where hundreds of millions of people still live by the hoe and sickle, as Chinese Academy of Sciences expert Lu Dadao recently pointed out. China surely needs better transportation infrastructure to reduce shipping costs, which are partly to blame for China's food inflation. What it doesn't need, however, are colossal traffic jams or highway fatalities. In sum, highways should be built for social and economic goals, and not for their own sake or the sake of private motorists.