Apparently we've inadvertantly helped develop a
bacterium that needs our waste to live:

http://story.news.yahoo.com/news?tmpl=story&u=/ap/20030703/ap_on_sc/toxic_feeder_5
"...Vinyl chloride is one of the most common and
hazardous industrial chemicals. It can linger in the
soil for hundreds of years and is present at about a
third of the toxic Superfund sites listed by the
Environmental Protection Agency (news - web sites). It
usually accumulates as a deteriorated form of more
complex compounds found in dry cleaning fluid and
metal cleansers. 

"Brief contact with vinyl chloride can cause
dizziness, drowsiness and headaches. Long-term
exposure can raise the risk of a rare form of liver
cancer, according to the EPA. 

"Loeffler has already tested the bacterium on vinyl
chloride at the contaminated site in Michigan. Its
ability to eat the toxic compound — and render it
harmless — was hastened in one test by adding plant
fertilizer and other nutrients to the soil. In another
trial, vinyl chloride was destroyed by injecting the
soil with concentrated amounts of BAV1 developed in
the lab.... 

"..."These organisms can only grow when the
contaminants are present," he said. "When the material
is gone, their numbers decline because they don't have
any food. So really it's a perfect system." 

Evolution In Action Maru  :)

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