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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.

A guest poster at the oil drum throws a little water over cellulosic ethanol (pouring a little water over scotch – good, over raging hype machines, even better).

What’s the moral in all of this? If corn ethanol is marginal on an energy returned on energy invested (EROEI) basis, it is very difficult to argue that biomass grown to make ethanol will be any better. To be blunt, if there are concentrated stocks of waste biomass in place, such as at lumber mills, then biomass ethanol probably makes sense. Otherwise, it appears to be more or less equivalent to corn based ethanol – in other words, a wash.

Overall, it’s a good take down. I am always leery about believing farm/agriculture promises because there’s way too much subsidy money involved for people not to have a vested interest in promoting some new plant or the other. Unfortunately, I know nothing about farming 🙁 , so I can’t judge his assumptions.

Why can’t we just agree to consume less (energy that is, not scotch)

Seriously, for every bit of bad news you read in the New York Times about coal, you read a good news story about the LA Times about coal!

State acts to limit use of coal power – Los Angeles Times

The California Energy Commission on Wednesday imposed new rules that effectively forbid the Los Angeles Department of Water and Power and all other municipal utilities in the state from signing new contracts with coal-fired power plants. The move, together with identical regulations imposed on private utilities in January, is a significant step toward reducing the contribution of California, the world’s sixth largest economy, to global warming.

This is important because California is a huge market and is imposing its market power wisely. It will buy coal power if sequestration actually works.

Technorati Tags: coal, environment

And Dog bites man, yet again, it’s amazing how they keep doing that. Think of all the money being wasted on re-proving the obvious, this is money not spent in mitigating the effects, money not spent on research, money not spent on encouraging people to use more efficient lighting… It’s a shame.

CNN.com – Study: Earth ‘likely’ hottest in 2,000 years – Jun 22, 2006

Climate scientists Michael Mann, Raymond Bradley and Malcolm Hughes had concluded the Northern Hemisphere was the warmest it has been in 2,000 years. Their research was known as the “hockey-stick” graphic because it compared the sharp curve of the hockey blade to the recent uptick in temperatures and the stick’s long shaft to centuries of previous climate stability.

The National Academy scientists concluded that the Mann-Bradley-Hughes research from the late 1990s was “likely” to be true, said John “Mike” Wallace, an atmospheric sciences professor at the University of Washington and a panel member. The conclusions from the ’90s research “are very close to being right” and are supported by even more recent data, Wallace said.

The panel looked at how other scientists reconstructed the Earth’s temperatures going back thousands of years, before there was data from modern scientific instruments.

For all but the most recent 150 years, the academy scientists relied on “proxy” evidence from tree rings, corals, glaciers and ice cores, cave deposits, ocean and lake sediments, boreholes and other sources. They also examined indirect records such as paintings of glaciers in the Alps.

Combining that information gave the panel “a high level of confidence that the last few decades of the 20th century were warmer than any comparable period in the last 400 years,” the academy said.

I must have been living in a cave somewhere to not have heard of this before today.

The Gapminder World 2006, beta

Gapminder is a non-profit venture that develops information technology for provision of free statistics in new visual and animated ways. In short, it enables you to make sense of the world by having fun with statistics. Our method is to turn boring data into enjoyable interactive animations using Flash technology. Gapminder is a Foundation in Stockholm, Sweden. Funding has been mainly by grants from Swedish International Development co-operation Agency, Sida. In collaboration with United Nations Statistic Division we promote free access to searchable public data and our animations of different types of data are freely available at www.gapminder.org.

The Pros
You have to take it for a test drive to see how cool it is, especially the animations to see how parameters like life expectancy, population, etc. change over time. You can pick countries to compare, or just scatter plot everyone. Look at Botswana’s life expectancy, for instance, see it peak in 1987 at 65 years and start a steep  plummet to 35 years in 2004 as its AIDS mass murder (epidemic is a word that does do this one justice) took hold. To watch the dot for life expectancy drop that quickly as you animate it is pretty powerful, as powerful as a statistic can be. Each parameter you change also changes the URL, so you can send links easily.

The Cons
You have to plot something against something else. Not everything is a scatter plot between two variables, you use it long enough, and you start seeing correlations (=causations!) where none exist. There’s no way to extract plots to use for later, though I guess you can do a screen capture.

Regardless, very cool, and nothing beats free access to large amounts of data that previously needed specialists to visualize and make sense of.