Posts tagged ‘Proceedings of the National Academy of Sciences of the United States of America’

27/06/2014

Scientists Say Water Shortages Threaten China’s Agriculture – Businessweek

China has a fifth of the globe’s population but only 7 percent of its available freshwater reserves. Moreover, its water resources are not evenly distributed. The lands north of the Yangtze River—including swaths of the Gobi desert and the grasslands of Inner Mongolia—are the driest, but more than half of China’s people live in the north.

An ancient stone bridge was discovered on the dried up lakebed of Poyang lake in Jiujiang, eastern China in 2013

Water is not well managed in China. Nearly two-thirds of water withdrawals in China are for agriculture. Due to the use of uncovered irrigation channels (leading to evaporation) and other outdated techniques, a significant portion of that water never reaches the field.

A new paper by scientists in China, Japan, and the U.S. published in the Proceedings of the National Academy of Sciences sounds the alarm: “China faces … major challenges to sustainable agriculture,” the authors write. Failure to conserve water resources could threaten China’s food security, a longtime priority for the country’s leaders.

via Scientists Say Water Shortages Threaten China’s Agriculture – Businessweek.

01/05/2014

China’s Income-Inequality Gap Widens Beyond U.S. Levels – Businessweek

The gap between China’s rich and poor is now one of the world’s highest, surpassing even that in the U.S., according to a report being released this week by researchers at the University of Michigan.

The metric used in these studies, the Gini coefficient, would be zero in a society in which all income is equally distributed, while a score of one would reflect a society in which all income is concentrated in the hands of a single individual. Over a three-decade period starting in 1980—shortly after China’s economic reform and opening commenced—the Gini coefficient has grown from 0.3 to 0.55 in 2010.

In the U.S., by contrast, the index reads 0.45. Anything over 0.50 is considered “severe disparity,” says the report in the Proceedings of the National Academy of Sciences. The authors used data from seven separate surveys conducted by a number of Chinese university-affiliated organizations, including Peking University’s Institute of Social Sciences.

via China’s Income-Inequality Gap Widens Beyond U.S. Levels – Businessweek.

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12/07/2013

How Shale Gas Can Save China From Itself

BusinessWeek: “For years the Chinese have been told that the blinding, sooty haze choking Beijing and other cities is the price of progress. Yet China’s appetite for energy is literally killing its people. A study published in the Proceedings of the National Academy of Sciences, based on data compiled between 1980 and 2000, estimated that pollution caused by burning coal stripped five years from the life expectancy of Chinese in the northern half of the country—a collective loss of 2.5 billion years. A separate study published in December in the Lancet attributed about a million deaths a year in China to air pollution.

Cars in Beijing travel on the road in heavy smog on March 7

Although other factors have contributed to the blackening of China’s skies—including millions of cars and motorbikes clogging roads—coal remains the deadliest. In the past decade, China’s coal consumption has more than doubled. It now burns almost as much coal as the rest of the world combined. In the first three months of the year, levels of PM-10 (particulates with a diameter of 10 micrometers or less) in Beijing were almost 30 percent greater than during the same period a year earlier.

By contrast, in the U.S. CO2 emissions hit an 18-year low in 2012. The reason? An explosion in shale gas production raised the share of electricity produced by natural gas from 20 percent to 30 percent, while bringing down the proportion produced by coal from 50 percent to 37 percent.

China’s recoverable shale gas reserves are estimated to be 25 trillion cubic meters, 50 percent larger than those of the U.S. The government has already announced subsidies to local shale gas producers; it should also help finance new pipelines and gas-fired power plants. Officials must lower barriers to entry and increase incentives to encourage the most innovative drilling companies—the majority of which are American—to work in China.

Shale is no silver bullet. In the near term, China will have to keep building coal-fired plants to meet its voracious energy demand. Yet failure to address coal pollution will condemn millions more Chinese to premature deaths. It’s hardly a choice.”

via Bloomberg View: How Shale Gas Can Save China From Itself – Businessweek.

10/07/2013

China’s reliance on coal reduces life expectancy by 5.5 years, says study

The Guardian: “Air pollution causes people in northern China to live an average of 5.5 years shorter than their southern counterparts, according to a study released on Monday which claims to show in unprecedented detail the link between air pollution and life expectancy.

Air Pollution Attacks Beijing Again : A tourist looks at the Forbidden City as PM25 covers

High levels of air pollution in northern China – much of it caused by an over-reliance on burning coal for heat – will cause 500 million people to lose an aggregate 2.5 billion years from their lives, the authors predict in the study, published in the journal the Proceedings of the National Academy of Sciences.

The geographic disparity can be traced back to China’s Huai River policy which, since it was implemented between 1950 and 1980, has granted free wintertime heating to people living north of the Huai river, a widely-acknowledged dividing line between northern and southern China. Much of that heating comes from the combustion of coal, significantly impacting the region’s air quality.

“Using data covering an unusually long timespan – from 1981 through 2000 – the researchers found that air pollution … was about 55% higher north of the river than south of it,” the MIT Energy Initiative said in a statement.

“Linking the Chinese pollution data to mortality statistics from 1991 to 2000, the researchers found a sharp difference in mortality rates on either side of the border formed by the Huai River. They also found the variation to be attributable to cardiorespiratory illness, and not to other causes of death.”

The researchers, based in Israel, Beijing, and the Massachusetts Institute of Technology, gauged the region’s air quality according to the established metric of “total suspended particulates (TSP),” representing the concentration of certain airborne particles per cubic meter of air.

The study concluded that long-term exposure to air containing 100 micrograms of TSP per cubic meter “is associated with a reduction in life expectancy at birth of about 3.0 years.””

via China’s reliance on coal reduces life expectancy by 5.5 years, says study | Environment | The Guardian.

19/06/2013

Rich Chinese Provinces ‘Outsource’ Pollution to Poor Ones

BusinessWeek: “A flurry of citizen-led protests against polluting (or proposed) chemical factories in Chinese cities has recently made headlines. And for good reason, as hundreds of peaceful marchers parading in front of government buildings and waving hand-made signs (such as “We Want to Survive” and “Say No to PX,” a hazardous chemical) isn’t something you see every day in authoritarian China.

The sun sets behind commercial buildings shrouded in haze in Shanghai

In recent years, such environmental demonstrations have erupted in the prosperous coastal cities of Xiamen, Dalian, Ningbo, and the southern city of Kunming. Middle-class citizens, wielding smartphones and sharing information about pollutants via social media, have organized the protests. When developers’ plans have been put on hold—as happened last month in Kunming—popular Chinese and Western media have declared a victory for nascent people power in China.

But what happens next? Chances are that factory plans won’t fizzle entirely, but rather that construction will move to another location—usually in a poorer province, with a less informed and media-savvy local population.

In a paper published in the June 10 issue of the Proceedings of the National Academy of Sciences (pdf), researchers at the Chinese Academy of Sciences, University of Maryland, and University of Cambridge mapped the flow of goods, money, and interprovincial emissions to document what they call the “outsourcing” of pollution “within China.” Their study focused in particular on CO2 emissions, which spew from the same coal-fired power plants and other factories responsible for smog-causing domestic pollution.

As the researchers discovered, “the most affluent cities of Beijing, Shanghai, and Tianjin, and provinces such as Guangdong and Zhejiang, outsource more than 50% of the emissions related to the products they consume” to provinces in the central and western hinterlands. In short, eastern urbanites enjoy the fruits of energy, steel, cement, and other goods produced in China’s less-developed regions. (To be sure, Western consumers also benefit from goods produced in China, at an even greater distance from the pollution.)

“Although China is often seen as a homogeneous entity, it is a vast country with substantial regional variation in physical geography, economic development, infrastructure, population density, demographics, and lifestyles” the researchers wrote. One example: The carbon footprint of residents of Shanghai, Beijing, and Tianjin, three wealthy eastern cities, is four times higher than that of residents of Guangxi, Yunnan, and Guizhou, three poor southwestern provinces.”

via Rich Chinese Provinces ‘Outsource’ Pollution to Poor Ones – Businessweek.

See also: https://chindia-alert.org/2013/06/19/china-launches-trial-carbon-trading-scheme/

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