Showing posts with label EARTH CLIMATE. Show all posts
Showing posts with label EARTH CLIMATE. Show all posts

12.3.11

Understanding Nature On Her Terms, And The Fear That Comes With It

 
Maasdam
Robert F. Bukaty/AP
  It is not enough to appreciate nature.
It is also crucial that we understand it.

Aldo Leopold has written a passage in his classic A Sand County Almanac that goes to heart of what I want to write about this morning.
No important change in ethics was ever accomplished without an internal change in our intellectual emphasis, loyalties, affections, and convictions. The proof that environmental conservation has not yet touched these foundations of conduct lies in the fact that philosophy and religion have not yet heard of it. In our attempt to make conservation easy, we have made it trivial. ...We can be ethical only in relation to something we can see, feel, understand, love, or otherwise have faith in.
Leopold wrote this passage in 1949, and it can certainly be said that religion and philosophy have since come to hear about conservation, in good part, because of the environmental movement that Leopold helped to catalyze.
But I hear him saying something more.
I hear him saying that it is not enough to appreciate nature.  It is also crucial that we understand it, deep in our bones.
Several years ago I attended a workshop where the speakers described various ways that environmental topics had been effectively woven into college curricula.  Many interesting programs were outlined. In not one presentation, however, was there any mention of science courses. Indeed, the S-word was never used in the entire two hours of discussion. Sustainability, yes, and stewardship and subsidies and self-restraint. But not science.
Let me take a short detour and bring to your minds another key social movement of the past 50 years, one that we can call cultural studies. We have come to realize that in order to have an appreciation of a culture other than one’s own, it is essential to leave one’s own culture-laden perspectives behind. To take in another culture requires a deep understanding of its language, its history, its dynamics, and its mythos from the perspective of those who inhabit that culture, from those who indwell. We now insist on hearing their voices.
In the same way, I would say, to understand a tree is not just to think of it as beautiful, or as a habitat for birds, or as provisioning shade for the ferns or loam for the forest floor.  A tree is all of these things, to be sure. But it is also carrying out photosynthetic electron transport and cyclic and non-cyclic phosphorylation and NADP reduction and DNA replication and lignin biosynthesis. To say that these vital activities of the tree are not interesting, or too difficult to understand, sounds dismissive to me, or even arrogant, like hearing someone say that he wants to observe a Central American culture through his own lenses, on his own terms, wants to pull up in a cruise ship and buy a few postcards and leave. To my mind, it is our obligation to understand how genes work and evolution happens and galaxies collide and water freezes and brains think and stars burn. This is the language and the history of our entire context. Trees speak in electrons and carbon and chemical bonds and DNA.
How could a curriculum on environmentalism leave these things out?
  Well, let’s begin with the perception that “these things” are not very interesting or too difficult to understand. True, our schools in the main do a terrible job of making science interesting, and an excellent job of making it incomprehensible. And true, the perceived linkage between scientific understanding and the technological use of scientific understanding fuels an anti-science bias in persons who are alarmed by the technological juggernaut (although to my mind, as I’ve developed here, this bias arises from a misunderstanding of how the science-technology linkage works).
But I pick up on something deeper: I encounter a resistance to scientific explanation. Resistance doesn't usually come from cognitive sources.  It comes from the gut. Therefore, I would suggest that much of the resistance to scientific explanation comes from what we can call a fear of reductionism. We fear, however inchoately, that to view the Sun in terms of its language of thermonuclear reactions and gravitational pressures will destroy our experience of the Sun’s majesty and the beauty of sunsets. We fear that to view life as the product of genes interacting with environment is to destroy the meaning of both life and environment. We encounter, that is, the ominous specter of “scientific materialism,” which sounds for all the world like soviet-style “dialectical materialism” that can morph into “diabolical materialism.” We shudder, a long existential shudder, and then we scurry back to thinking about nature on our own aesthetic and political terms.
Poor matter. This magical stuff, undergirding everything that we know to exist, including the minds that hold our understandings of existence, is so often given disparaging qualifiers, like “mere” matter or “just” matter or “only” matter. What else, pray tell, would we want to be made of?
So the resistance, I submit, is embedded in our fear that we will somehow lose what we sometimes call our spirituality by encountering our context in material form. And to lose our spirituality, we fear, is to lose our humanness, our soulfulness, our capacity for transcendent experience. We will become automatons.
Here’s what I say to undergraduates when we arrive at this potentially gloomy juncture. I say to them, OK, a good-looking guy walks by and I feel my pulse quicken and my face flush. Do I say to myself, aah, norepinephrine released from my sympathetic neurons has just stimulated my sinoatrial node to generate increased cardiac output? Of course not. I say to myself, Wow, that’s a really good-looking guy!  It’s not like I can’t go there. I can certainly reflect on how interesting it is that the experience I just had was mediated by action potentials and calcium influx. But, I assure them, this doesn’t wreck the experience. It’s just a second way to think about it. The immediate experience, the subjective experience, is uncompromised. Subjectivity, in the end, is immune to anything but its own inherent experiential manifestations.

Learning More About Climate Change

Over at the NYT's Green Blog there is an excellent post pointing to resources for learning more about the basic science behind Climate Science. Lots of good sources to bookmark in there.
Through all the political debate it's important to remember how beautiful the science (physics, chemistry, etc) going on in climate studies can be.

Tracking A Tsunami Barreling Across The Ocean


Experts can predict a tsunami's arrival, but it's hard to know how high a wave will hit shore.
 
A fishing boat lies on its side in shallow water in the boat basin at Crescent City, Calif., after a tsunami surge withdrew March 11. The surges broke loose and damaged most of the 35 boats that remained in the harbor.
Jeff Barnard/AP A fishing boat lies on its side in shallow water in the boat basin at Crescent City, Calif., after a tsunami surge withdrew March 11. The surges broke loose and damaged most of the 35 boats that remained in the harbor.

The largest earthquake known to have hit Japan has killed hundreds of people and caused widespread damage. The quake also created a large tsunami whose waves washed away boats, roads and buildings. The tsunami continued eastward across the Pacific and has struck Hawaii and now parts of the west coast of the U.S.
This chart from the National Oceanic and Atmospheric Administration shows how the tsunami is expected to travel across the Pacific Ocean. The dark black and purple indicate the highest rise in sea level. The light gray lines indicate when the tsunami wave is expected to arrive. View High-Res Version
NOAA This chart from the National Oceanic and Atmospheric Administration shows how the tsunami is expected to travel across the Pacific Ocean. The dark black and purple indicate the highest rise in sea level. The light gray lines indicate when the tsunami wave is expected to arrive. View High-Res Version
As the tsunami rolled past Hawaii Friday morning, some places reported surges of 6 or 7 feet, according to experts at the National Oceanic and Atmospheric Administration.
Hours later, Crescent City, Calif., at the northern end of the state, got hit harder. Rich Young, harbor master at the fishing town, said he and everyone else had been evacuated early Friday morning, as have residents of many Western seaside communities. Young says the harbor took a beating.
"The entire inner boat basin is destroyed," he says. "There are approximately 35 boats that are sunk. Boats are jumbled on top of each other, and it's just a hell of a mess."
Young, speaking from an emergency center near the town, says no injuries had been reported.
The first wave measured at about 6 feet, and though it didn't push water up onto land, the huge amount of water did destroy docks and boats. A tide of that size is not abnormal — but it usually rises slowly over eight hours.
"In a tsunami, it happens in 15 or 20 minutes," Young says. "You just get this enormously strong current. It's like Niagara Falls in a harbor."
There is just a limited amount of time you can get out of harm's way in terms of a tsunami. Some people will always be caught up in that kind of short time frame.
As Young was describing the damage, he got word of yet another wave — this one, 8.1 feet high.
Rapid Response From The Warning Systems
Those waves started on the other side of the Pacific and took about 12 hours to cross the ocean. The amount of energy released was about 30 times that of the 1906 San Francisco earthquake.
Japan's earthquake was a subduction zone quake, meaning a section of the seafloor suddenly thrusts up and down. That, explains geophysicist Eric Geist of the U.S. Geological Survey, lifts the water above the seabed all the way up to the surface.
"You're lifting the whole water column up above where it's not supposed to be, and then the tsunami waves spread out from there," Geist says.
Japan has what scientists say is the most comprehensive tsunami warning system in the world. Engineers have stretched cables out from the land and attached instruments that measure water pressure and tides.
NOAA's Pacific Tsunami Warning Center also operates its own set of warning sensors — 32 of them in the Pacific alone.
"Within nine minutes, our Pacific Tsunami Warning Center had a warning out for Japan, Russia, Marquis Island and the Northern Marianas," says Laura Furgione, a NOAA scientist. "And 12 minutes later, our West Coast and Alaska Tsunami Center had a message out."
Uncertainty In Predicting Wave Height
But Geist says that's not a lot of time for Japanese coastal communities. The nearest city to the quake's epicenter was just about 80 miles away, and Geist says there may have only been about 15 minutes' warning.
"Even with a good system like that, there is just a limited amount of time you can get out of harm's way in terms of a tsunami," Geist says. "Some people will always be caught up in that kind of short time frame."
As the waves traveled east toward Hawaii and North America, the warning system's pressure sensors on the seafloor monitored the tsunami's speed and predicted when the wave might hit.
Once a tsunami reaches shallower water, the mass of water bunches up — there's nowhere for it to go but up, and the wave bounces off land masses, which creates a chaotic pattern of new waves.
"It's very difficult to predict exactly how high the tsunami is going to be, so that uncertainty is something we're still having to live with, I think," Geist says.
Another uncertainty: how many more waves are still to come. Scientists are warning coastal residents that waves could continue to arrive for hours after the first one.
 

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9.3.11

ALL MAPPED OUT

AN UNDERWATER LAKE

THE MIGHTY POWER OF THE SUN

FUTURE LIFE ON EARTH

Wilson on saving life on Earth

THE ARROW OF TIME

A thought-provoking talk about the nature of time, the origin of entropy, and how what happened before the Big Bang might be responsible for the arrow of time we observe today.


Sean Carroll on the arrow of time (Part 1)

Sean Carroll on the arrow of time (Part 2)

OUR FUTURE from a cosmic perspective



Sir Martin Rees examines our planet and its future from a cosmic perspective. He urges action to prevent dark consequences from our scientific and technological development.

HONG KONG - PRECIOUS SPACE

ARMAGEDON SCENARIO

8.3.11

A SINKING NATION

Scientists Doubt Meteorite Carried Life To Earth

Could life have rained down on Earth from outer space? That tantalizing prospect has been raised in a new scientific paper by NASA scientist Richard B. Hoover of the Marshall Space Flight Center in Huntsville, Ala. The only problem with the research seems to be that most scientists who have seen the work think it's probably wrong.
The paper argues that microscopic filaments Hoover sees in carbonaceous meteorites were made by bacteria in the meteorite before it fell to Earth.
If you discover something that seems like it might be extraordinary, there's this human nature — you tend to think, 'Wow, I made this great discovery,' as opposed to 'This can't be right.'
But there are other explanations, too.
"There are all sorts of chemical processes that lead to spheres and hollow balls and filaments," says George Cody, a geochemist at the Carnegie Institution for Science. And even if the shapes are signs of long-dead microorganisms, Cody says, it's hard to be certain any signs of life in a meteorite found on Earth came from outer space.
"More likely than not, if you didn't take extraordinary precaution ... they'd be quickly infected by both [terrestrial] fungal microorganisms and bacteria," he says.
Hoover wasn't available to comment, so it's hard to know his motivations. But it's not hard to understand why a scientist would want to share what he thinks is a dramatic discovery with the world.
"Scientists are discovery junkies," says Robert Hazen, a colleague of Cody's at the Carnegie Institution.
"They always want to discover something new — that's why we're in the game. And if you discover something that seems like it might be extraordinary, there's this human nature — you tend to think, 'Wow, I made this great discovery,' as opposed to 'This can't be right.' "
Skepticism Is Key
But skepticism is crucial. Fifteen years ago, another group of scientists claimed they saw signs of life in a meteorite from Mars recovered in Antarctica. The media hoopla accompanying that paper was, perhaps, more justified, since the claim had been more thoroughly vetted by other scientists, and NASA held a press conference trumpeting the results.
A few years later, most scientists were convinced the finding was wrong. And this time, NASA wants nothing to do with the new claims of life.
Hazen says a finding that proves to be wrong isn't necessarily a bad thing.
"We've learned so much from what was basically a bunch of Mars meteorites that don't have any compelling evidence for life, but they sure have some fascinating chemistry," he says.
And Hazen admits there's a small chance this new report is correct.
"There have been some extraordinary claims in the past that have been right," he says. "It takes years to confirm they are right, but once in a while, they are."
Hazen is sure of one thing: If the new claim is wrong "it will be corrected. There's no question about it. Science will come up with the correct explanation for these filament-like structures and we'll move on," he says, and eventually close in on the truth.

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