Bisphenol A Linked to Breast Cancer

Byoliveridley

Chemical & Engineering News: Latest News – Bisphenol A May Trigger Human Breast Cancer

Soto and her colleagues exposed pregnant rats to bisphenol A at doses ranging from 2.5 to 1,000 µg per kg of body weight per day. By the time the pups exposed at the lowest dose reached the equivalent of puberty (50 days old), about 25% of their mammary ducts had precancerous lesions, a proportion three to four times higher than among the nonexposed controls. Mammary ducts from all other exposure groups showed elevated levels of lesions. Cancerous lesions were found in the mammary glands of one-third of the rats exposed to 250 µg/kg/day.

Bisphenol A is used in the manufacture of polycarbonate plastics and epoxy resins. It is found in many food and beverage containers, including baby bottles. It is also found in canned food linings and dental composites, and it leaches from all of these products. In one study, Soto notes, urine samples from 95% of the human subjects contained the chemical.

The Environmental Protection Agency has set a safe human intake dose of 50 µg/kg/day for bisphenol A. “On the basis of the effects observed in recent studies, this seems to be an unsafe level,” Soto says.

Bisphenol A is old news, BTW, people have known for a while about this chemical’s propensity to carcinogenicity. Of course, there’s that whole argument about pregnant mice being more susceptible to chemicals than humans, etc. So, the jury is still out. but Soto is right, 50 µg/kg/day seems to not provide enough of a safety factor. The EU uses 10 µg/kg/day, though they do say that

realistic worst-case estimates of consumer exposure via foodstuffs, range from 0.00048 mg/kg bw/day for adults to 0.0016 mg/kg bw/day for infants, which is well below the maximum exposure level

Of course, who knows what additive effects this chemical may have with the multitude of other chemicals floating around. Doing tests of single chemicals and trying to link that to epidemiological data is a perilous undertaking, the connections are tenuous most of the time and the plastics companies routinely fund studies that prove otherwise, because as you know, if you know what you’re going to find before you study it, you will find it!

Read the wikipedia stub on polycarbonates. Us yuppies who drink religiously from Nalgene bottles to avoid phthalates and nasty tastes would do good to take note! I guess glass is the best, though it does have that annoying tendency to shatter when dropped… Water from glass bottles do have the best taste, though.

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  • Canada's only proposed Carbon Targets in Danger

    Byoliveridley

    Bill C-311, Canada’s Climate Change Accountability Act, is back in the “news” (no silly, not the media, who have more important things to worry about). I had written about this before the Copenhagen meeting. This bill sets Canada up with greenhouse gas emission reduction targets that would put Canada in a respectable mainstream position, 25% below 1990 levels by 2020, 80% below 1990 levels by 2050. But the Conservatives, in one of their classic legislative gambits, have forwarded the vote for April 14th, Wednesday. If the bill doesn’t pass here, it’s dead, and 4 years of countless committee readings, and multiple votes to pass would be wasted. And Canada will not have any climate change legislation whatsoever.

    Serious business, isn’t it? Climate Action has more, including what you need to do (I know, short notice, that’s apparently how important decisions get made around here).

    The Liberals hold the key. It was they who voted with the Conservatives the last time to scuttle the pre-Copenhagen vote. As of writing this post, no official word from the Liberals on their position.

    A call to Michael Ignatieff’s office, (613) 995-9364 gives me little hope of passage. I was told that the MPs had met, that Mr. Ignatieff would not be voting (apparently, because it’s a private member’s bill, leaders don’t vote, weird). Also, the official position of the party is that because it is a private member’s bill, that every MP would be free to vote on their “conscience”. Given that the Liberal party could not even defend women’s health in a recent whipped vote, I wonder where their conscience is on this.

    A call to David McGuinty’s (the Liberal Environmental Critic) Office, (613) 992-3269, elicited the rather helpful response that they would not be commenting on their stand till after the vote.

    Of our local MPs, both Denise Savoie (NDP) and Dr. Keith Martin (Liberal) will be voting to preserve the bill, they are on record saying this at a forum on climate change last week. Of course, Gary Lunn (Conservative) is not part of the equation here, pointless.

    So, call, call and call away, the Liberals need to hear about this. They don’t appear to understand the most basic rule of opposition politics, you get no points for supporting the government, except from pundits in the mainstream media. Only if you inflict some defeats on the government will the people of Canada take you seriously.

    David McGuinty – (613) 992-3269
    Michael Ignatieff – (613) 995-9364

    As always, remember that it is the Liberals that will be blamed for this bill’s demise, we all know the Conservative position on climate change. The NDP and Bloc Quebecois have voted repeatedly to pass this legislation. It is Michael Ignatieff’s Liberals who will stand in the way of Canada’s environmental progress.

  • Goodbye Conventional Coal, for now.

    Byoliveridley

    In a move that signals the start of the our clean energy future, the Environmental Protection Agency’s Environmental Appeals Board EAB ruled today EPA had no valid reason for refusing to limit from new coal-fired power plants the carbon dioxide emissions that cause global warming. The decision means that all new and proposed coal plants nationwide must go back and address their carbon dioxide emissions.

    via Sierra Club: Email – Ruling: Coal Plants Must Limit CO2

    This is huuuuuuuuuuge.

  • Plastic Bag Use – Money Talks

    Byoliveridley

    In 2002, Ireland passed a tax on plastic bags; customers who want them must now pay 33 cents per bag at the register. There was an advertising awareness campaign. And then something happened that was bigger than the sum of these parts.Within weeks, plastic bag use dropped 94 percent. Within a year, nearly everyone had bought reusable cloth bags, keeping them in offices and in the backs of cars. Plastic bags were not outlawed, but carrying them became socially unacceptable — on a par with wearing a fur coat or not cleaning up after one’s dog.

    Motivated by a Tax, Irish Spurn Plastic Bags – New York Times

    Turns out that you can swiftly alter habits, attitudes, perception and behavior by charging people 33 cents per bag! Plastic bags are a convenience only because they are free.

    Also, if you read the entire article, you will realize that ad-hoc, voluntary, or piecemeal approaches by individual retailers, cities or states will not make as much of an impact as a national policy.

    All hail Ireland!

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  • Climate Deniers Get Top Science Posts

    Byoliveridley

    Seriously, I’ve had enough of Bush North up here in Canada, he has to go and luckily, he’s only running a minority government, so it’s not 4 more years…

    globeandmail.com: Global warming critics appointed to science boards

    Top Canadian scientists are accusing the Harper government of politicizing science funding and jeopardizing climate research by naming global warming critics to key boards that fund science.

    The government’s actions are “dreadful,” said Garry Clarke, a leading international glaciologist at the University of British Columbia, and undercut public pledges to tackle climate change.

    “Their mouths are doing one thing and their hands are doing something different,” Prof. Clarke said.

    Already alarmed over funding cuts to basic research, scientists say two appointments in particular are worrisome. Mark Mullins, the executive director of the conservative-leaning Fraser Institute – and a former adviser to the Canadian Alliance Party – was recently appointed to the Natural Sciences and Engineering Research Council of Canada (NSERC), which funds university research projects that have included studies on climate change.

    Desmogblog has more, including choice quotes from the economists and oil geologists that run this country’s science.

    Mullins: “It strikes me that the science is not settled,” he said in a 2007
    interview posted at BCbusinessonline. “‘Put caps on global emitters’ is
    not the natural conclusion I would come to.”

    Weissenberger: “To those who doubt the scientific basis of global warming theory, we
    say: Don’t let a cabal of government-funded scientists, environmental
    activists and journalists convince us they’re the mainstream.” — April
    28, 2006″

    These are the people who will be deciding who gets science money in Canada.

    This has probably been the most unscientific administrations in Canada’s recent history.

    I think it is time to throw the bums out, it’s time for another election!

  • Do Voluntary Environmental Programs Work?

    Byoliveridley

    Through the most excellent Environmental Valuation & Cost-Benefit News blog comes notice of a book that answers a question that’s been on my mind off and on.

    Environmental Valuation & Cost-Benefit News – Post details: Reality Check: The Nature and Performance of Voluntary Environmental Programs in the United States, Europe, and Japan

    Despite a growing theoretical literature trying to explain how and why voluntary programs might be effective, there is limited empirical evidence on their success or the situations most conducive to the approaches. Even less is known about their cost-effectiveness.

    The book’s called Reality Check (and long byline) and at $40 is too expensive for a look see! But here’s a teaser:

    The central goals of Reality Check are understanding outcomes and the relationship between outcomes and design. Most of the programs it studies have positive results, but they are small compared with business-as-usual trends and the impact of other forces–such as higher energy prices. Importantly, potential gains may be quickly exhausted as the “low-hanging fruit” is picked up by voluntary programs. By including in-depth analyses by experts from the U.S., Europe, and Japan, the book advances scholarship and provides practical information for the future design of voluntary programs to stakeholders and policymakers on all sides of the Atlantic and Pacific.

    So, the answer is no, I guess. Voluntary programs catch the bulk of changes that can be carried out easily anyway and may have been part of the company plans. They also make for good Company PR. The greater the threat of regulation and good enforcement, I guess, the more power you have to set up a good voluntary program. But if it is all carrot and no stick, who knows…

    For an example of what a voluntary program looks like, here’s Climate Wise from the EPA.

  • |

    Scientist speaks up

    Byoliveridley

    Vote for [Liberal Party Leader] Stéphane Dion; don't vote for the Green Party," Weaver said in an interview promoting Keeping Our Cool: Canada in a Warming World.

    "If the Green Party has a strong candidate who's going to beat out the Liberal and Conservative candidates, then, okay, go ahead and vote Green. But, by and large, a green vote is not a Green vote. A green vote is for a Liberal government and Stéphane Dion. There is no other candidate you can vote for.

    Scientist speaks up.

    Victoria’s most prominent scientist wants you to vote for a Liberal Party candidate in this Canadian election.