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Monday, 29 September 2008

The silent killer or the matter of proportions

Funnily, this is the second article on Nitrogen I stumble upon. The first was few months ago in NewScientists. Activist are being surprisingly quite on that issue. Do I smell censure, or do I smell money? Who knows...

It looks like in the whole Carbon fuss, we lost a major player in Global Warming-the Nitrogen. Or, should I say, maybe we didn't loose it, maybe we were diverted from it, because it's not like we didn't know the problem with fertilizers. We just paid too many attention in other direction(s), luckily for some people. By "some people" I refer to agriculture lobby that is SO strong in both sides of Atlantic. I often criticise that fact in MyEuropeanDream, so this was in EU, I'm not starting to understand it's not so much different in USA. And that's not very nice...
Anyway, back on Nature-Nitrogen, as we know, is the biggest component of our atmosphere, but this is its passive, inert form. When it is in active form, or reactive, it has various uses in the cycle of living organisms. And in our society, it's been know as the best fertilizer. The problem is that like anything else off the balance, its over-use leads to disasters and kills off the impacted area. That is obviously a problem. Then why there are no regulation for the over-use of fertilisers when they go back into the water and when they concentrate enough, they start killing? It's a known fact, then why nobody is talking about it?
The article:

Beyond Carbon: Scientists Worry About Nitrogen’s Effects

Published: September 1, 2008

TOOLIK FIELD STATION, Alaska — As Anne Giblin was lugging four-foot tubes of Arctic lakebed mud from her inflatable raft to her nearby lab this summer, she said, “Mud is a great storyteller.”

Dr. Giblin, a senior scientist at the Marine Biological Laboratory in Woods Hole, Mass., is part of the Long Term Ecological Research network at an Arctic science outpost here operated by the University of Alaska at Fairbanks.

Public discussion of complicated climate change is largely reduced to carbon: carbon emissions, carbon footprints, carbon trading. But other chemicals have large roles in the planet’s health, and the one Dr. Giblin is looking for in Arctic mud, one that a growing number of other researchers are also concentrating on, is nitrogen.

In addition to having a role in climate change, nitrogen has a huge, probably more important biological impact through its presence in fertilizer. Peter Vitousek, a Stanford ecologist whose 1994 essay put nitrogen on the environmental map, co-authored a study this summer in the journal Nature that put greater attention on the nitrogen cycle and warned against ignoring it in favor of carbon benefits.

For example, Dr. Vitousek said in an interview, “There’s a great danger in doing something like, oh, overfertilizing a cornfield to boost biofuel consumption, where the carbon benefits are far outweighed by the nitrogen damage.”

Soon after Dr. Vitousek’s report, the journal Geophysical Research Letters branded as a “missing greenhouse gas” nitrogen trifluoride, which is used in production of semiconductors and in liquid-crystal displays found in many electronics. Nitrogen trifluoride, which is not one of the six gases covered by the Kyoto Protocol, the celebrated international global warming accord, is about 17,000 times more potent than carbon dioxide. Its estimated worldwide release into the atmosphere this year is equivalent to the total global-warming emissions from Austria.

Dr. Galloway is developing a universal calculator for individual nitrogen footprints. “It’s Goldilocks’s problem,” he said in an interview. “Reactive nitrogen isn’t a waste product. We need it desperately. Just not too much and not too little. It’s just more complicated than carbon.”

Dr. Giblin of Woods Hole spent the summer at the field station here, midway between the Arctic Circle and the Arctic Ocean, researching the nitrogen content of lakebed sediment — not the inert nitrogen that makes up 80 percent of air, the reactive nitrogen that Dr. Galloway referred to. In forms like nitric acid, nitrous oxide, ammonia and nitrate it plays a variety of roles.

Nitrogen is part of all living matter. When plants and animals die, their nitrogen is passed into soil and the nitrogen in the soil, in turn, nourishes plants on land and seeps into bodies of water. Dr. Giblin is pursuing her research because as the Arctic warms, the tundra’s permafrost will thaw, and the soil will release carbon and nitrogen into the atmosphere.

When an ecosystem has too much nitrogen, the first response is that life blossoms. More fish, more plants, more everything. But this quickly becomes a kind of nitrogen cancer. Waters cloud and are overrun with foul-smelling algae blooms that can cause toxic “dead zones.” Scientists call this process eutrophication, but the laymen’s translation is that the water gets mucked up beyond all recognition. A recent such plague bedeviled China when its Yellow Sea was smothered in algae at Qingdao, the planned site of Olympic sailing events this summer. More than mere inconvenience, such problems routinely threaten many coastal areas and riverside communities.

Nancy Rabalais, executive director of the Louisiana Universities Marine Consortium, is known as Queen of the Dead Zone. She cruises around the Gulf of Mexico every summer in the research vessel Pelican to look for damage from nitrogen-rich river flows into the gulf. This year, she expects a dead zone that will beat the Massachusetts-size 8,500-square-mile bloom of 2002.

One of the problems, Dr. Rabalais said, is that the Mississippi River involves so many communities that it requires stronger federal guidance, which she said was not a part of the Bush administration’s policies. She continued: “Because you’re not just going up against the agribusiness lobby, but also the livelihood of farmers. It’s not exactly popular in the Midwest.”

Fertilizer use is largely inefficient. With beef, only about 6 percent of nitrogen used in raising cows ends up in their meat; the rest leeches out into air or water supplies. With pork, it is 12 percent; chicken, 25 percent. Milk, eggs and grain have the highest efficiency, about 35 percent, or half of what, in the metric of report cards, is a C-minus.

“Look,” she said, “you just can’t have all these states and all these communities knowingly overfertilizing their land because they want a bumper crop every year. That’s just all kinds of bad. But Des Moines, for example, is willing to filter their drinking water to an extra degree just to be able to flood their water supply with more-than-normal levels of fertilizer.”

Reactive nitrogen competes with greenhouse gases that have greater public awareness.

Environmentalists face the puzzle of how to deal with multiple problems at once. And some worry that after the hard-fought campaign spotlighting carbon, turning to focus on nitrogen could upset that momentum.

The tension can plague even the most informed and articulate campaigners. “One of the many complexities that complicate the task I’ve undertaken is complexity,” said Al Gore. source

1 comment:

nkagarwal said...

nkagarwal said...
I am looking for people interesten in researches regarding the mysteries of Nature. I have a web site wherein I intend pointing out to the Scientific community many beliefs which are being relied upon since ages but do not have a scientific proof. Your interest in Nitrogen & old Civilization is encouraging More on hearing from you. Do you have you website.
B.Sc.(Engg.), M.A.Sc. (Toronto)
M.ASCE.(USA), M.I.E.(Ind.)F.I.V.(Ind).