Environmental Factors


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 The American Denial of Global Warming - Perspectives on Ocean Science (Video 58mins)

Naomi Oreskes, Professor of History, Science Studies Programme, University of Californa, San Diego.

Polls show that between one-third and one-half of Americans still believe that there is "no solid" evidence of global warming, or that if warming is happening it can be attributed to natural variability. Others believe that scientists are still debating the point. Join scientist and renowned historian Naomi Oreskes as she describes her investigation into the reasons for such widespread mistrust and misunderstanding of scientific consensus and probes the history of organized campaigns designed to create public doubt and confusion about science.

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 The Disappearing Male - From Virility to Sterility (Video 44mins)

The Disappearing Male is a CBC documentary about one of the most important, and least publicized, issues facing the human species: the toxic threat to the male reproductive system. The last few decades have seen steady and dramatic increases in the incidence of boys and young men suffering from genital deformities, low sperm count, sperm abnormalities and testicular cancer. At the same time, boys are now far more at risk of suffering from ADHD, autism, Tourette's syndrome, cerebral palsy, and dyslexia. The Disappearing Male takes a close and disturbing look at what many doctors and researchers now suspect are responsible for many of these problems: a class of common chemicals that are ubiquitous in our world. Found in everything from shampoo, sunglasses, meat and dairy products, carpet, cosmetics and baby bottles, they are called "hormone mimicking" or "endocrine disrupting" chemicals and they may be starting to damage the most basic building blocks of human development.

Factsheet: Male Infertility

* There are more than 20 heavily industrialized nations where the birth of baby boys has declined every year for the past 30 years - amounting to 3 million fewer baby boys.
* The number of boys born with penis abnormalities and genital defects has increased by 200% in the past two decades.
* Boys have a higher incidence of attention deficit hyperactivity disorder, learning disabilities, Tourette's syndrome, cerebral palsy and dyslexia.
* Boys are four times as likely to be autistic.
* The average sperm count of a North American college student today is less than half of what it was 50 years ago.
* The quality of sperm is declining. Eighty-five per cent of the sperm produced by a healthy male is DNA-damaged.
* Damaged sperm have been linked to a 300% increase in testicular cancer - a form of cancer that affects young men in their 20s and 30s.
* The chemical industry has developed more than 90,000 man-made chemicals in the last sixty years. Eighty-five percent of them have never undergone testing for their impact on the human body.

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A new electromagnetic exposure metric: High frequency voltage transients associated with increased cancer incidence in teachers in a california school (Research Article)

Background
In 2003 the teachers at La Quinta, California middle school complained that they had more cancers than would be expected. A consultant for the school district denied that there was a problem.

Objectives
To investigate the cancer incidence in the teachers, and its cause.

Method
We conducted a retrospective study of cancer incidence in the teachers' cohort in relationship to the school's electrical environment.

Results
Sixteen school teachers in a cohort of 137 teachers hired in 1988 through 2005 were diagnosed with 18 cancers. The observed to expected (O/E) risk ratio for all cancers was 2.78 (P = 0.000098), while the O/E risk ratio for malignant melanoma was 9.8 (P = 0.0008). Thyroid cancer had a risk ratio of 13.3 (P = 0.0098), and uterine cancer had a risk ratio of 9.2 (P = 0.019). Sixty Hertz magnetic fields showed no association with cancer incidence. A new exposure metric, high frequency voltage transients, did show a positive correlation to cancer incidence. A cohort cancer incidence analysis of the teacher population showed a positive trend (P = 7.1 * 10 ^ -10) of increasing cancer risk with increasing cumulative exposure to high frequency voltage transients on the classroom's electrical wiring measured with a Graham/Stetzer (G/S) meter. The attributable risk of cancer associated with this exposure was 64%. A single year of employment at this school increased a teacher's cancer risk by 21%.

Conclusion
The cancer incidence in the teachers at this school is unusually high and is strongly associated with high frequency voltage transients, which may be a universal carcinogen, similar to ionizing radiation. Am. J. Ind. Med. 51:579-586, 2008. 2008 Wiley-Liss, Inc.

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