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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Perchlorate Coverup?

Byoliveridley

Pentagon pressured EPA on perchlorate

The federal government has been inconsistent and at times intentionally silent on how much perchlorate is safe in drinking water. As a result, environmental groups contend, defense contractors and the government have been indefinitely shielded from cleanup costs while infants and pregnant women are exposed to a chemical that impairs thyroid function and can slow infant brain development.

Perchlorate is the oxidizing component of rocket fuel that has been proven to interfere with thyroid function at low levels. The defense department is probably the single largest source of localized contamination. So, expecting the EPA (politically appointed head) to regulate the defense department (politically appointed head) is a little naive.

Industry advocates argue that the science on perchlorate is not precise enough to warrant strong — and extremely costly — remedies.

Ah, where would we be without the plutocracy-protectionary principle!

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Eastern United States vulnerable to climate change

Byoliveridley

http://www.eurekalert.org/pub_releases/2007-12/pu-sdn121007.php
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Time to get out of the Eastern United States? A study to be published in the Proceedings of the National Academies of Science tries to quantify the relative risk of climate change using something called a “socioclimatic” risk factor. As always, the redder the worse. A look at the paper would no doubt be more illuminating, but for some reason, press releases about PNAS papers come out way before the papers actually become public. China is in bright red all the way, India in a rather bright orange. Where I live, the Eastern United States, is a nice beet red. No doubt, the unprecedented drought the South is experiencing right now is a nice big red signal.

Interesting stuff, though the actual paper will tell the story. Any technique that tries to integrate all the complex scientific, social and economic variables of climate change into one number is bound to have a flaw or two. But such a metric is useful for estimating relative risk, as the authors themselves say.

He added that the study does not address the absolute degree of impact or risk.

“This study illustrates exposure of one nation relative to another,” Diffenbaugh said. “Thus, it is important to note that a country low on the relative scale could still face substantial risk.”

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Colonialism: Environmental Edition

Byoliveridley

Does put recycling in context…

Independent Online Edition > Environment

Regardless of how carefully you separate your waste, there is a good chance a disposal firm will dump it all in together with other kinds of plastic trash and ship it to the developing world to be dealt with by a family of migrant workers earning a pittance. They will deal with the salad-bar container, the pistachio ice-cream container and the superfluous bag for carrots in your shopping basket in a variety of different ways – it may be recycled, it may become landfill or it may simply be burnt. Whatever happens, it is generally not a priority for the waste disposal company. Britain dumps around two million tonnes of waste in China every year, everything from plastic mineral water bottles to shopping bags and other forms of superfluous packaging from some of the country’s biggest supermarkets.

Same for India as well. The article says that all of this “recycling” is illegal. But how do you hide 200,000 tonnes of plastic waste?

Read the whole article, it is tragic. Some highlights:

So too are the many and varied health complaints suffered by the local population, who risk multiple skin ailments and exposure to potent carcinogens as they touch the contaminated materials. Poisonous chemical effluents stream into their water supply, turning it black or lurid red, and studies by Greenpeace show that acid rain is the norm in this region. Children are prone to fevers and coughs. Their skin is often disfigured by the toxic plastic waste they have to process.

A report by the University of Shantou on the town of Guiyu, another Guangdong recycling hub, showed that more than 80 per cent of local children suffer from lead poisoning.

Gulf States spending more on Clean Energy than Canada

Byoliveridley

Gasoline sells for 45 cents a gallon. There is little public transportation and no recycling. Residents drive between air-conditioned apartments and air-conditioned malls, which are lighted 24/7

Still, the region’s leaders know energy and money, having built their wealth on oil. They understand that oil is a finite resource, vulnerable to competition from new energy sources.

So even as President-elect Barack Obama talks about promoting green jobs as America’s route out of recession, gulf states, including the emirates, Qatar and Saudi Arabia, are making a concerted push to become the Silicon Valley of alternative energy.

They are aggressively pouring billions of dollars made in the oil fields into new green technologies. They are establishing billion-dollar clean-technology investment funds. And they are putting millions of dollars behind research projects at universities from California to Boston to London, and setting up green research parks at home.

Meanwhile, we in Canada are pushing hard to completely ignore environmental concerns as we push to expand the incredibly dirty tar sands. I read an interesting New York Times article recently, summarizing the issues with this dirty oil. Of course, the CO2 emissions, and the incredibly nasty effects of mining, water pollution, etc. are well documented. One fact stuck in my head – The cost to replace one tire in one of the earth moving vehicles is $60,000. What a wasteful enterprise on such a grand scale, whose only purpose is to carry on business as usual when business as usual is going to result in catastrophic climate change in the not so distant future.

Global warming wins the Nobel peace price

Byoliveridley

Well, I guess if Gore had become president of the US, this would not have happened (among other things that would not have happened). On the other hand, the U.S would have conceivably taken a leadership role in the issue (if the senate and congress would have cooperated).

Gore and U.N. Panel Win Peace Prize – New York Times

Former Vice President Al Gore and the U.N.’s Intergovernmental Panel on Climate Change won the 2007 Nobel Peace Prize Friday for their efforts to spread awareness of man-made climate change and lay the foundations for counteracting it.

”I am deeply honored to receive the Nobel Peace Prize,” Gore said. ”We face a true planetary emergency. The climate crisis is not a political issue, it is a moral and spiritual challenge to all of humanity.”

Gore’s film ”An Inconvenient Truth,” a documentary on global warming, won an Academy Award this year and he had been widely expected to win the prize.

What does this do for climate change? Well, nothing! Unfortunately! Good for the IPCC, though. And, good for Gore. I thought at the beginning of 2007 that this was the year that worldwide perceptions about the threat of global warming would change, Gore’s movie and the IPCC report had a big hand in making that happen.

A Bounty on the IPCC Global Warming Report

Byoliveridley

Scientists offered cash to dispute climate study | The Guardian | Guardian Unlimited

Scientists and economists have been offered $10,000 each by a lobby group funded by one of the world’s largest oil companies to undermine a major climate change report due to be published today. Letters sent by the American Enterprise Institute (AEI), an ExxonMobil-funded thinktank with close links to the Bush administration, offered the payments for articles that emphasise the shortcomings of a report from the UN’s Intergovernmental Panel on Climate Change (IPCC).

Well, that speaks for itself, no comment required.