Wednesday, July 25, 2007
Trophic Cascade
Trophic cascade. Such a lovely term for a not-so-lovely phenomenon. A trophic cascade is a domino effect in the natural world, wherein if one part of an ecosystem is taken away, the others around it eventually fail. According to "The Sixth Extinction" by Terry Glavin, deforestation has been a major cause of trophic cascades around the world. Once the trees are gone, the plants and animals dependent upon the trees tend to go extinct if they can't find another area to move into. Trouble is that it's not only the plants and animals that suffer, but human beings, too. Once a trophic cascade really gets going, its eventual outcome is to take human culture with it as well.
Political upheaval can also cause a trophic cascade. Witness Iraq. Did you know that Iraqi farmers are not allowed to save agricultural seeds from year to year? Or that the U.S. government ordered Iraqi seed stocks to be destroyed during the war? Neither did I, until someone mentioned it at my writers group. I looked it up. Unfortunately, 'tis true under Order 81 of The Coalition Provisional Authority. There is a more intelligible discussion of the issue at CorpWatch. While I had no idea this was going on, I've been well aware of the cultural destruction in Iraq, having heard quite a bit about the looting of Iraqi museums.
According to Glavin, the current extinction cycle, the sixth in the earth's history that we're aware of, is by far the most destructive of all the extinction cycles because we have twice the average biological diversity of any other period on earth. The other extinctions were the Ordovician, Devonian, Permian (most destructive before this one), Triassic, and Cretaceous, which took the dinosaurs.
Although the entire subject is incredibly depressing if you're paying attention (and we all should be paying attention, because our necks are on the line), Glavin's book is not depressing, but quite hopeful. Along with pointing out the complex interplay between species and the causes of extinction, he regularly discusses the ways that humans have attempted to stem the bleed of species extinctions, in some cases even reversing extinctions. Bald eagles, which I rarely ever saw in central Minnesota as a child, now often fly over the area where I work. We've even seen flocks of them in area fields. They've made such a comeback that they've been removed from the Endangered Species list. Wild turkeys are also returning in force, as are timber wolves.
Human beings can be a wondrous force for change, if we put our minds to it.
Political upheaval can also cause a trophic cascade. Witness Iraq. Did you know that Iraqi farmers are not allowed to save agricultural seeds from year to year? Or that the U.S. government ordered Iraqi seed stocks to be destroyed during the war? Neither did I, until someone mentioned it at my writers group. I looked it up. Unfortunately, 'tis true under Order 81 of The Coalition Provisional Authority. There is a more intelligible discussion of the issue at CorpWatch. While I had no idea this was going on, I've been well aware of the cultural destruction in Iraq, having heard quite a bit about the looting of Iraqi museums.
According to Glavin, the current extinction cycle, the sixth in the earth's history that we're aware of, is by far the most destructive of all the extinction cycles because we have twice the average biological diversity of any other period on earth. The other extinctions were the Ordovician, Devonian, Permian (most destructive before this one), Triassic, and Cretaceous, which took the dinosaurs.
Although the entire subject is incredibly depressing if you're paying attention (and we all should be paying attention, because our necks are on the line), Glavin's book is not depressing, but quite hopeful. Along with pointing out the complex interplay between species and the causes of extinction, he regularly discusses the ways that humans have attempted to stem the bleed of species extinctions, in some cases even reversing extinctions. Bald eagles, which I rarely ever saw in central Minnesota as a child, now often fly over the area where I work. We've even seen flocks of them in area fields. They've made such a comeback that they've been removed from the Endangered Species list. Wild turkeys are also returning in force, as are timber wolves.
Human beings can be a wondrous force for change, if we put our minds to it.
Labels: animals, eagles, earth, extinction, human being, iraq, minnesota, plants, seeds, terry glavin, trophic cascade, turkey, wolves
Monday, June 18, 2007
A Tidy Summary
I have been looking for a complete list of the current White House administration's crimes against the U.S. Over at Dangerous Intersection, Erich Vieth posted a link to a list that mostly fits the bill. It's called "What Every American Should Know About Iraq" by David Michael Green. Now, if we could just include the denial of habeas corpus, the crap people have to put up with at airports in the name of security, the wire tapping of U.S. citizens, the Iraq Oil Bill, the diversion of Presidential business emails by Karl Rove through private email carriers, and the fiasco with the Attorney General's Office and U.S. Attorneys, etc., etc., plus any crittery things this administration's done that we don't know about yet, we could build a good case for treason. Lest you think that treason is too strong a word, here's the dictionary definition: "1: the betrayal of a trust: treachery 2: the offense of attempting by overt acts to overthrow the government of the state to which the offender owes allegiance . . . ." I'd say the Bush Administration has been trying to overthrow the U.S. government for some time now, wouldn't you?
Labels: dangerous intersection, david michael green, erich vieth, george w. bush, iraq, karl rove, treason
