No sun link to climate change

Yes, strained headline!

A Toxic Hand-Me-Down — Balter 2007 (327): 1 — ScienceNOW

Environmental contamination can cause cancer and birth defects. Of particular concern are a group of toxic chemicals called endocrine-disrupters, which interfere with reproductive hormones and may cause sterility. A new study, published online this week in the Proceedings of the National Academy of Sciences, suggests that these chemicals can change reproductive behavior as well, and that these behavioral changes can be passed on from parents to offspring. If correct, these changes could alter the course of evolution by giving natural selection new targets to act on.

In 2005, a team led by reproductive biologist Michael Skinner of Washington State University in Pullman reported in Science that the fungicide vinclozolin, an endocrine-disrupter used to spray vineyards and other crops, causes fertility defects in the male offspring of female rats treated with the chemical. These defects are, in turn, passed down to the males of subsequent generations. The toxin did not appear to be altering gene sequences; instead, Skinner and colleagues found, vinclozolin was somehow causing other chemical groups to latch onto certain genes, changing their expression (Science, 3 June 2005, p. 1391). The phenomenon is known as epigenetic inheritance. Last year, Skinner’s group identified 15 epigenetically altered DNA sequences in the sperm of the vinclozolin-treated rats

More signs of intergenerational effects of low levels of endocrine disruptors. I had blogged recently about Bisphenol A having intergenerational effects (where exposure to a chemical agent causes consequences for offspring and off off spring, etc).

It’s still early, but remember Children of Men (good movie, see it).

As part of blog action day, today’s a day when every blog features a post about the environment. Turns out that this is an environmental blog where most of the posts are about the environment. But nothing like a deadline for a noble cause to make me blog, so here goes…

What the rich use and throw away, the poor are reduced to scavenging to earn a meager living. Yes, while climate change rightly takes up a lot of attention, more mundane problems including landfills in poor communities, the export of waste from the first world to the third world, and the “shocking” poverty that drives this export of waste all deserve their fair share of attention.

U.N.: ‘Shocking’ conditions at Kenya dump – World Environment – MSNBC.com

“Willis Ochieng, 10, scavenges through smoking refuse piled as high as a house at one of Africa’s biggest rubbish mountains, his friends sitting nearby sucking on dirty plastic bottles of noxious yellow glue.

Located near slums in the east of the Kenyan capital Nairobi, the open dump receives some 2,000 tons of garbage daily. A U.N. study published on Friday says it is seriously harming the health of children and polluting the city.”

And boy, do the people there suffer. Asthma, anemia, high levels of lead in the blood, chronic cough, and a smorgasbord of other acute and chronic conditions.

This dump is not alone, of course. Landfills are a feature of every country, and in my current home state of North Caroiina, are located with disproportionate frequency in African American communities. the free market advocate would say that this represents an opportunity for the people in the community to gain some employment and make some money. The truth of the matter, however, is that we do not pay the right price for waste generation. The people who live near, and make a living off the “dump” subsidize our profligate selves.

Interesting side note about the spinach E-Coli outbreak

Leafy Green Sewage – New York Times

Where does this particularly virulent strain come from? It’s not found in the intestinal tracts of cattle raised on their natural diet of grass, hay and other fibrous forage. No, O157 thrives in a new — that is, recent in the history of animal diets — biological niche: the unnaturally acidic stomachs of beef and dairy cattle fed on grain, the typical ration on most industrial farms. It’s the infected manure from these grain-fed cattle that contaminates the groundwater and spreads the bacteria to produce, like spinach, growing on neighboring farms.

Well, talk about unforeseen consequences, cows really should not eat grain. Go watch my favorite food cartoon ever, the Meatrix, and its most excellent sequel, The Meatrix 2: Revolting for more.

When cows were switched from a grain diet to hay for only five days, O157 declined 1,000-fold. This is good news. In a week, we could choke O157 from its favorite home — even if beef cattle were switched to a forage diet just seven days before slaughter, it would greatly reduce cross-contamination by manure of, say, hamburger in meat-packing plants.

Seems easy enough to implement, if impossible to enforce.

Update

A more nuanced look, if not a debunking of the above theory can be found on this scienceblogs page.