CHINA’S SILVER LINING
Why smoggy skies over Beijing represent the world’s greatest environmental opportunity
James Fallows
The Atlantic Monthly, June 2008
Chinese cement plants and coal mines are grim enough taken separately. Often they come as a package, the plant built next to the mine to minimize transport costs for the vast quantities of coal the cement-making process consumes. Converting limestone and other materials to the intermediate form of cement called “clinker” requires heating them to more than 2,600°F. Getting kilns this hot requires burning about 400 pounds of coal for each ton of cement produced. The clinker then cools before it goes through further processing—but the waste heat and exhaust gas are sent straight into the sky, at temperatures of 650F or more, along with the extra carbon dioxide the limestone emits as it becomes cement.
In coal-and-cement towns in China, people and buildings are colored black by the coal dust swirling around them, and coated gray and white by the cement dust that leaks from the kilns and clinker coolers and pours from the exhaust stacks. Driving through the foothills of the Tibetan plateau in western Sichuan province last year, my wife and I could tell from miles away when we were nearing a cement plant, from the grayish pall in the air and the thickening layers of dust on the trees and road. With so much of the country under construction so fast, and with China’s equivalent of America’s interstate highway system being built in the space of a few years, modern China can appear to be made out of concrete. Nearly half of the world’s cement is produced and used in China, and cement factories are a major source of both the country’s surging demand for energy and the environmental damage that is the most shocking side effect of China’s economic miracle.
(...) [artículo aquí]
Why smoggy skies over Beijing represent the world’s greatest environmental opportunity
James Fallows
The Atlantic Monthly, June 2008
Chinese cement plants and coal mines are grim enough taken separately. Often they come as a package, the plant built next to the mine to minimize transport costs for the vast quantities of coal the cement-making process consumes. Converting limestone and other materials to the intermediate form of cement called “clinker” requires heating them to more than 2,600°F. Getting kilns this hot requires burning about 400 pounds of coal for each ton of cement produced. The clinker then cools before it goes through further processing—but the waste heat and exhaust gas are sent straight into the sky, at temperatures of 650F or more, along with the extra carbon dioxide the limestone emits as it becomes cement.
In coal-and-cement towns in China, people and buildings are colored black by the coal dust swirling around them, and coated gray and white by the cement dust that leaks from the kilns and clinker coolers and pours from the exhaust stacks. Driving through the foothills of the Tibetan plateau in western Sichuan province last year, my wife and I could tell from miles away when we were nearing a cement plant, from the grayish pall in the air and the thickening layers of dust on the trees and road. With so much of the country under construction so fast, and with China’s equivalent of America’s interstate highway system being built in the space of a few years, modern China can appear to be made out of concrete. Nearly half of the world’s cement is produced and used in China, and cement factories are a major source of both the country’s surging demand for energy and the environmental damage that is the most shocking side effect of China’s economic miracle.
(...) [artículo aquí]
Posts
No comments:
Post a Comment