Slide Shows | Environment

Smoky Home: Cleaning Up Indoor Air with Human Waste

The secret weapon in the fight against indoor air pollution—and deforestation—in China might be decomposing human waste

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WOOD WORK:
thumb: WOOD WORK:
WOOD WORK: Chinese demand for wood--for everything from construction to fuel--is driving deforestation and follow-on floods both within China and abroad, in countries such as Indonesia. [Link to this slide]
David Biello / © Scientific American
WOOD WOES:
thumb: WOOD WOES:
WOOD WOES: A combination of logging and rising demand for fuel wood has leveled forests throughout China, such as the one that used to cover this hillside overlooking the town of Liming in Yunnan Province. [Link to this slide]
David Biello / © Scientific American
LAND RUSH:
thumb: LAND RUSH:

LAND RUSH:

A booming population has also driven farmers into formerly natural areas. "We farm anywhere we can farm," notes Cun (Angela) Yanfang, a Chinese environmentalist working for the Nature Conservancy and RARE....[More]

PORK PRODUCT:
thumb: PORK PRODUCT:
PORK PRODUCT: The Chinese farmer's tendency to cook fodder for pigs also contributes to an ever-expanding demand for firewood. [Link to this slide]
David Biello / © Scientific American
SMOKE INSIDE:
thumb: SMOKE INSIDE:
SMOKE INSIDE: Old stoves such as the one pictured here burn wood inefficiently as well as contributing to indoor air pollution at least 16 times higher than U.S. or World Health Organization standards. [Link to this slide]
David Biello / © Scientific American
SUPERIOR STOVE:
thumb: SUPERIOR STOVE:
SUPERIOR STOVE: Better designed wood-burning stoves, such as the one pictured here, can halve wood burning. Having such a stove has also meant less work for Feng Yu's parents. [Link to this slide]
David Biello / © Scientific American
WASTE TO FUEL:
thumb: WASTE TO FUEL:

WASTE TO FUEL:

Concrete pits, such as the one being installed in Liming by middle school principal Dong Fang, are used to store human waste, allowing it to be digested by microbes and turned into methane or, as the Chinese call it, marsh gas....[More]

WASTE FULL BURN:
thumb: WASTE FULL BURN:
WASTE FULL BURN: Such methane can then be piped to household burners, such as the one being demonstrated here by Shijialing village leader Shi Tongkang in Shandong Province. [Link to this slide]
David Biello / © Scientific American
OUTFOXING WASTE:
thumb: OUTFOXING WASTE:
OUTFOXING WASTE: To supplement incomes and the amount of waste in such biogas systems, the villagers of Shijialing have also begun tending extra animals, such as these foxes raised for their pelts. [Link to this slide]
David Biello / © Scientific American
BIOGAS BOONDOGGLE?
thumb: BIOGAS BOONDOGGLE?
BIOGAS BOONDOGGLE? Despite decades of effort, most recently by environmentalist Cun (Angela) Yangfang pictured here, biogas stoves have not become ubiquitous in China. [Link to this slide]
David Biello / © Scientific American
SIGN OF THE TIMES:
thumb: SIGN OF THE TIMES:
SIGN OF THE TIMES: "We believe it is very important to leave something for future generations," Cun says. "But, sometimes, to survive, [people] use it," speaking of the vestiges of once abundant timber. [Link to this slide]
David Biello / © Scientific American
MORE AND LESS:
thumb: MORE AND LESS:

MORE AND LESS:

Liming middle schoolers get that message through the Student Earth Helpers program. This poem, written as part of that program, translates:
"If more smoke in the sky, birds will be less
If more boats in the sea, fish will be less
If more people in the mountains, animals will be less
If more cars in the forest, trees will be less."
On the bright side, the poet might have added: if more biogas in the village, deforestation--and a whole host of related environmental issues--will be less....[More]

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4 Comments

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  1. 1. slywy 12:47 PM 8/4/08

    The fox photo is sad . . .

    Reply | Report Abuse | Link to this
  2. 2. etherspirit 02:17 AM 8/6/08

    Ecological sanitation is a nascent opportunity that help with energy, environmental, and sanitation needs. Great!

    Reply | Report Abuse | Link to this
  3. 3. globleinfosol 03:26 AM 10/5/10

    well ! generally i found that Chinese always run fast than others. really they are a great hard worker.

    Reply | Report Abuse | Link to this
  4. 4. globleinfosol 03:27 AM 10/5/10

    i would be feel happy to say that they do their best everywhere.
    <a href="http://www.globalseopoint.com">Seo</a>

    Reply | Report Abuse | Link to this
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