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China's construction waste is piling up at a rate of less than 5 percent

China's demolition of old buildings, especially violent demolition projects, to provide land for urban development has had some well-known consequences. Foreign media pointed out that in recent years, the demolition and reconstruction of China is increasingly facing another unpleasant fact: Piles of construction waste.

　　The New York times said on October 20 that while the problem is often covered up, the amount of rubbish is growing. It has become increasingly inescapable: hundreds of millions of tons of construction waste are quietly dumped around China's major cities every year. Now, people living on the outskirts of big cities or in surrounding villages wake up to find a rubbish dump of buildings thrown around their houses. This happens almost every week.

　　China's cities have vast recycling networks: ragpickers ride tricycles to buy and sell plastic, metal and paper waste. But construction waste is almost completely ignored.

　　Lu Weisheng, associate professor of architecture at the university of Hong Kong, said: "once demolition and construction waste is generated, it cannot be disposed of.He says metals are mainly recycled, accounting for only a small fraction of the total waste. “ The rest of the waste cannot be dealt with systematically and can only be thrown everywhere.”

　　Mr Lu is checking the amount of construction waste produced in China each year. Despite the lack of accurate statistics, available figures show that the problem is getting worse.The life span of Chinese buildings is usually 30 years, 75 years in the United States and even longer in Europe.Extrapolating from Shanghai's annual demolition records, Mr Lu estimates that China produced more than 2bn tonnes of construction waste in 2011.In Japan, up to 95 percent of construction waste is recycled. But in China, the figure is roughly the opposite, with less than 5 per cent of recycled waste.

　It is reported that in China, a large increase in construction waste control through recycling has only just begun. Beijing Xinao concrete Co.,Ltd. has set up factories in Guiyang and Lanzhou, major cities in China, to grind up construction waste and make concrete.

　It was an international environmental ngo, the climate group, that helped design the recycling programme for the company. "It looks like a small thing, but it means a lot," said wu changhua, the group's President for greater China.

　Ms. Wu says the business model for recycling construction materials is very mature. Recycling construction materials will push China towards its official goal of promoting environmental protection. This will relieve the pressure on landfills, reduce littering, and reduce destructive practices such as digging river beds and quarrying rocks for concrete.

But concerns about the quality of construction may not be entirely acceptable for the public to use recycled materials to build homes and offices.

For recycled building materials to be widely recognized, Mr. Wu said, Chinese consumers must first be reassured about their safety. "In the eyes of the Chinese people, what is called 'rubbish' feels like 'waste'," she said. This is very negative. We need to change that. It takes a lot of effort.”