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Message Area
Sci / Health / Environment

Enviro. May 12 '05 PCBs

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#1 of 2

     Posted 5/13/05 2:37 AM   
Sue_N
 
From  Sue_N  Posts 3452  Last 12:11 AM
To  All      [Msg # 196275.1 ]    

What do you think can be done to reduce the amounts of PCBS and other pollutants in the environment?

Polychlorinated biphenyls (PCBs)

Polychlorinated biphenyls (PCBs) consist of man-made chlorinated hydrocarbons; there are 209 possible kinds, and they have been used industrially since 1930. Uses have included electrical components, plastics, carbonless copy paper, paint additives and heat exchange fluids. They tend to contaminate soils, sediments and flesh rather than being dissolved in water, but can be transported long distances by water. They can also enter the atmosphere and be transported that way. They are to be found in the Arctic, for example, as well as in food in much of the inhabited world.

Some PCBs are more toxic than others. Elevated levels of PCBs in the blood are associated with a variety of symptoms. People are harmed by a variety of contaminated foods such as rice oil (for example in Japan in 1968 and Taiwan in 1979), but in modern America contamination is more likely to come from eating fish and shellfish. PCBs can kill fish and birds or prevent animals from breeding.

Some people are more susceptible than others; for example pregnant women, fetuses, nursing babies, children, anglers, the elderly, and some ethnic groups. Children born up to 7 years after their mother was exposed can suffer health and neurobehavioral and developmental problems. Symptoms may include liver disease, diabetes, cancers (e.g. non-Hodgkin's lymphoma) and low resistance to infection.

People contaminated by PCBs may also have been contaminated by other Persistent Organic Pollutants (POPs), and they are related to some POPs such as dioxins and furans. The speed with which different PCBs break down in the environment varies, with some being long enough that they can accumulate considerably in the food chain.

Recent news stories involving PCBs include:

EPA: Chemical Pollution Falls 6 Percent

The Environmental Protection Agency (EPA) says that overall chemical pollution in United States has fallen, although levels of mercury, polychlorinated biphenyls (PCBs) and dioxin have risen. PCB production was banned in 1979 but releases increased 1,000%. Releases of mercury were up 41%; the Clean Air Act includes provision for a reduction in coming years, and the EPA recently issued new rules, which some states are contesting. PCBs and dioxins are Persistent Organic Pollutants and subject to the Stockholm Convention on Persistent Organic Pollutants (POPs). Releases of lead are also rising.

Please see the following message for the remaining stories.

Sue [sysop in NewsForum, World Issues, All Animals forums]
Edited 5/13/05   by  Sue_N
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#2 of 2

     Posted 5/13/05 2:42 AM   
Sue_N
 
From  Sue_N  Posts 3452  Last 12:11 AM
To  All      [Msg # 196275.2 Message 196275.2 replying to 196275.1 196275.1 ]    

Other Stories

NYC Officials Battle Longhorned Beetles

The Asian longhorned beetle has infested 2 Central Park trees and these have been chopped down. The beetles are an invasive species from China which has caused many trees in New York state to be chopped down or treated.

Gardeners Warned About Planting Weeds

North Dakota state agriculture officials are warning customers not to inadvertently buy and plant noxious weeds, some of which are ornamental plants, from garden centers. Customers should check the scientific name.

Officials Fear Spread of Oak Disease

The fungal disease Sudden Oak Death, which has already killed thousands of trees on the West Coast, has been spread South on ornamental plants shipped from nurseries. Owners are asked to watch out for spots on leaves and dead twigs on camellias, rhododendrons and other ornamentals. Do you think that it is time that we stopped importing non-native species?

Salmon farm escapees threaten wild cousins-WWF

The WWF conservation group believes that 25% of the fish found off Norway have escaped from fish farms. This is a threat to the wild races through interbreeding and parasites as well as competition for food. The percentage is believed to be considerably higher in some fjords. Salmon born in Norwegian rivers are believed to make up around 50% of all wild Atlantic salmon.

Fishing Industry Hurt as Salmon Runs Drop

The number of Chinook salmon swimming up the Columbia River to spawn this spring remains extremely low. The fishing industry and related industries have been badly hit. When salmon fishing was banned 3 weeks ago only 2,030 had been spotted, but that number has risen to around 50,000 which, although very low, is higher than the 10,000 of 1995 which was the lowest year.

34 Bases on Worst Toxic Waste Sites List, Top 10 Polluted Former Military Bases

The United States Environmental Protection Agency (EPA) includes 34 military bases on the Superfund list of worst toxic waste sites. They are among more than 100 Defense Department facilities that have not been completely cleaned up. The latest round of base closings being considered is likely to add to the list. Not only do stockpiles of weapons need to be safely disposed of, but also there has been contamination of soil and groundwater. The cleanups may be expensive, but without them the sites cannot be converted to new uses.

Bahrain May Build Sea Horse-Shaped Island

Several islands have been created in the Persian Gulf, and Bahrain plans to create one in the shape of a sea horse. Environmentalists are concerned because a coral reef will be destroyed. Do you think that real sea horses should be put at risk for this development project?

New Species of Rodent Found in Laos

A new rodent found in Laos is not only a new species, but belongs to a previously unknown family.

Bed bugs threaten to put bite on U.S. hotel industry

The number of requests to pest control firms and entomologists for help with bed bug infestations has risen, particularly from hotels, etc. DDT was used to keep them down in the late 1940s and 1950s in America, but it has now been banned. Bed bugs are not known to carry disease.


What do you think can be done to reduce the amounts of PCBS and other pollutants in the environment?

[Views expressed are those of the author, and do not necessarily reflect those of CompuServe, the Forum or any government, agency or news organization. External Websites are "At Your Own Risk," and no endorsement is expressed or implied.]

Sue [sysop in NewsForum, World Issues, All Animals forums]
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Sci / Health / Environment

Enviro. May 12 '05 PCBs

  
 
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