Showing posts with label extinction. Show all posts
Showing posts with label extinction. Show all posts

On Thin Ice: The Changing World of the Polar Bear (Vintage) Review

On Thin Ice: The Changing World of the Polar Bear (Vintage)
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On Thin Ice: The Changing World of the Polar Bear (Vintage) ReviewEllis, a writer, artist, and conservationist mainly known for his work on matters maritime, here turns his attention to Ursus maritimus. The polar bear is the largest modern land predator, albeit one that spends significant time in the water and depends on the marine food web.
The book is, not surprisingly, a very good one. It has Ellis' trademarks of thorough research (there is a typical Ellis bibliography, running 26 pages) and good writing. My favorite turn of phrase comes when, after reviewing how all sorts of polar bear parts are used for decoration and so on following legal hunts in Greenland, the author remarks, "In other words, nothing is wasted except the bear."
This book is a superb introduction to the polar bear, its world, and its interaction with humans. I had a pretty good idea from other reading how remarkable this animal and its adaptations are, but a lot of the bear-human history surprised me. For example, I had no idea anyone had, or could, or would want to, train a polar bear team to pull a sled.
The most surprising thing for me, though, was how numerous the animals must have been centuries ago. Early European explorers didn't just see the occasional bear: they saw dozens, or, over a season, sometimes hundreds. I asked Richard if anyone knew the species' population before Europeans entered its realm. It may have approached twice today's estimate of around 22,000, but he cautioned there was no reliable number. All that's certain is that hunting and indiscriminate killing removed many thousands.
Ellis seems to have read every account by explorers, whalers, and everyone else who ever saw a polar bear. The bear's behavior is explored in depth, and some myths rejected. An excellent chapter explores why humans are so darn fascinated with the polar bear, along with the contradiction between our love for the adorable cubs vs. our historic willingness to kill adults even when there is no need to.
Then we get to the threatened status of the bear today. The species still numbers many thousands, and is not actually going to disappear anytime soon. However, there is no question that, as Ellis documents, climate change will affect polar bears more quickly and more severely than it will most species.
A side note is that, in an unaired portion of a 2008 interview I did for the series MonsterQuest, I hypothesized that declining ice to the north and more human development to the south would push brown bear and polar populations together, resulting in more "pizzly" hybrids. I tossed that off the top of my head at the time: I didn't realize that, as Ellis shows, more qualified people have advanced the same idea. A hybrid shot in 2006 is the first proven example of a cross occurring in the wild, but it likely won't be the last.
When Ellis discusses climate change, the reader gets the impression that it's a simple case of sometimes-hyperbolic but pure-hearted environmentalists vs. totally evil corporations and Republicans. I'm not about to defend the Bush environmental record, but there are debates about everything from the conflicting estimates of warming to the tradeoffs (never mentioned here) in outlawing oil and gas development in northern regions, and Ellis could have acknowledged that these subjects are complex even as he makes a persuasive case for action.
Summary: If the polar bear has an official biographer, it is Ellis. It's the same role Ellis played in his outstanding books about the great white shark and the giant squid. The result is a tome everyone with an interest in nature, bears, or the environment should read.
- Matt Bille, author, Shadows of Existence: Discoveries and Speculations in Zoology (Hancock, 2006) ([...])
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The Call of Distant Mammoths: Why The Ice Age Mammals Disappeared Review

The Call of Distant Mammoths: Why The Ice Age Mammals Disappeared
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The Call of Distant Mammoths: Why The Ice Age Mammals Disappeared ReviewPeter Ward writes his book, The Call of Distant Mammoths, like a murder mystery (a metaphor he uses several times). The victims are the large mammals that disappeared after the last ice age. The perpetrator? Who knows? Peter Ward's thesis fingers early hunters who came across the Asian land bridge as a major, perhaps the major, cause of extinction.
Like any good mystery book, Ward starts before the beginning by taking the reader on an imaginary trip in a time machine through past eras, periods and epochs as he revisits the major extinction events in earth's history and reviews their causes. The most recent, and perhaps best-known, extinction event is that at the K/T boundary that saw the extinction of the dinosaurs. In all his examples, Ward makes the point that extinctions are rapid (at least on geologic time scales) events. I tend to agree, though I'd probably define rapid in terms of the speed with which organisms evolve.
Ward gives some good background information regarding general points related to evolution. I especially enjoyed his clear but brief summary of human evolution, as well as the evolutionary history of elephants. With this introduction (which takes up about 1/3 of the book) Ward begins to make his case by examining the period of time around the last ice age. Ward finds more than coincidence in the emergence of human society and extinction of the large mammals at the end of the last ice age. As he puts it:
"The time of the Ice Age is of utmost importance to humanity, for it is the time of our origin. We began this interval as australopithecines, ape-like forms living and dying among the other wildlife of Africa. We ended the ice Age, only 10,000 years ago, as humans, living on every continent except Antarctica. For humanity, the Ice Age was the crucible of evolution."
I remain fascinated by the idea that the ice age may have somehow precipitated a crucial event in human evolution, and in doing so led both to our emergence as a species, and to the extinction of many ice-age mammals.
I found chapter 5 particularly interesting. This chapter, titled "Wheel of Fortune," illustrates the problems with viewing evolution as strictly survival of the fittest, partly because the terminology is somewhat circular and self-referencing. Many organisms that seem perfectly fit for survival end up extinct because of pure, dumb, blind luck. Things like errant meteorites and other rapid changes to the environment make the process of evolution something like a roulette wheel. From another point of view, what constitutes "fit" today may constitute "unfit" tomorrow, given significant changes in the environment.
It's not until the latter sections of the Book that Ward gets down to business and describes how our species precipitated the ice-age extinctions. In one explanation, human-caused fires were a major contributor. I must admit, I found this explanation wanting. Even today (with billions of our species on the globe and millions of urbanites seeking outdoor recreation) lightning-caused fires far outnumber those caused by people. Perhaps these primitive societies started the fires deliberately? At any rate, it seems that climatic changes that led to drying out, with more dry lightning would precipitate more fires than our early primitive ancestors would. But that's just intuition - right? Perhaps our ancestors were more destructive than I think they were. What seems equally hard to accept is that a few million hunters managed to cause the entire extinction of the mammoths and other large North-American mammals that went extinct at the end of the last ice age.
Perhaps the strongest point Ward makes is the correlation between the appearance of people in other areas (notably Australia) and local extinctions there. I found this particularly persuasive. I must admit to being skeptical about the proposed reasons, but the fact of a positive correlation cannot be casually dismissed. The presence of our species seems to correlate well with the extinction of lots of species - then and now. There remain, however, exceptions to be explained. After all, our species emerged from Africa, and Africa today has the world's largest assortment of large animals.
I believe the weakest area of Ward's thesis remains the (nearly) simultaneous extinction of literally dozens of other large animals at the same time as the mammoths. While ancient cultures, armed with obsidian spears, might have had a penchant for mammoth flesh, and caused their extinction, would (could) they have been such voracious hunters as to do the same thing to horses camels, and rhinoceri? These other species remain relatively anonymous in Ward's book, and I think the argument Ward makes would have been far stronger had he proposed how those animals also went extinct at the hands of primitive hunters.
I found Ward's results of computer simulations, showing that even relatively minor hunting can lead to extinction in a population that is already under stress, very interesting. It wouldn't be the first time our species has caused another to go extinct. Indeed many scientists would argue that people are currently precipitating the largest extinction event since the one that killed all the dinosaurs.
Having read Ward's book was an enriching experience. For me, this book illustrates the thrill of science.Unanswered questions and the thrill of the chase are what make science such a rewarding enterprise. If natural science is your bailiwick, you'll find lots to like about The Call of Distant Mammoths. I highly recommend it.
Duwayne Anderson June 15, 1999The Call of Distant Mammoths: Why The Ice Age Mammals Disappeared Overview

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The Watchman's Rattle: Thinking Our Way Out of Extinction Review

The Watchman's Rattle: Thinking Our Way Out of Extinction
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The Watchman's Rattle: Thinking Our Way Out of Extinction ReviewIn The Watchman's Rattle: Thinking Our Way Out of Extinction, Rebecca D. Costa gives us the following premise: that as societies advance they invariably run up against a cognitive threshold, "the point at which a society can no longer think its way out of its problems." This seems bizarre on the face of it because how else can you solve problems but by thinking? But she offers an alternative: insight. In contrast to left- and right-brain thinking, which have us search through pre-existing solutions and problem solving techniques, insight seems to occur to us out of thin air (though usually after the correct mental preparation). Insight, Costa claims, is "evolution's gift to us."
Once Costa has introduced the idea of insight being the solution to our problems and points out that many people already do have answers, she asks, what stands in our way from acting on these solutions? Costa says that what stands in our way of acting on good, insightful solutions are supermemes. Supermemes are ideas that have such strong support or opposition that the mere mention of them clouds peoples' thinking or prevents people from even looking at alternatives.
(An example she uses of an insightful solution for global warming, for example, is that of releasing sulfur dioxide into the stratosphere to form sulfate particles that would, in effect, shade the earth. The reason this solution is saved as a last resort, I've heard, is because there is much worry about whether we could tip the environment too much the wrong way and lose control of our planet's temperature.)
In a separate chapter for each, the five supermemes she sees as preventing us from solving our problems are:
Irrational Opposition - This is when people criticize vehemently, but without offering solutions of their own. This has led to, among other things, politicians basing entire careers on attacking their one main opponent (in a two-party system) rather than proposing their own ideas, because proposing their own ideas would leave them open to attack. With no one proposing ideas for fear of losing their seats in the house or senate, no progress can ever be made.
The Personalization of Blame - Costa argues that most of our problems today are systemic problems. Yet, most Americans were raised with the idea of rugged individualism. So we tend to find scapegoats rather than solve our problems systemically and permanently. One example she uses is obesity. We like to blame overweight people for being lazy hedonists without self-discipline. But we don't factor in our constant bombardment of advertisements designed by the best cognitive experts in the world, our unsafe neighborhoods, our environments that may have no place to play or ride bikes safely, our sedentary jobs and long commutes, or the comparative cheapness of processed and fast food over natural produce due to the way we subsidize farmers.
Counterfeit Correlation - Most people confuse correlation with cause and thus want to go off spending society's limited resources on the wrong things. An example might be blaming teachers for our nation's poor performance in education, when the real reasons might include both parents working, English as a second language, dysfunctions at home, inadequate diets, violent neighborhoods, lack of school supplies, etc.
Silo Thinking - This is where government agencies, departments within corporations, or scientific specialties either don't communicate with each other or deliberately hold onto information and power. This "separate territories" idea was what allowed 9/11 to happen when, together, if only they shared information, both the FBI and CIA had enough information to prevent it. Another example she gives is NASA's developing an extremely cheap satellite solar solution for energy that would beam energy down to every house in the country much the way TV is beamed by satellite. Yet, when NASA approached the Department of Energy they were accused of mission creep and told to stick to space exploration.
Extreme Economics - In this chapter she concisely shows how and why money came into being and the results of an experiment asking, what happens when chimps are exposed to money and inflation? (Answer: depression, aggression, hoarding, robbery, and prostitution.) Though the chapter's title might lead you to expect otherwise, she avoids the words capitalism and socialism. Instead, she says extreme economics occurs when "simple principles in business, such as risk/reward and profit/loss, become the litmus test for determining the value of people and priorities, initiatives and institutions." She is not totally against capitalism (one of her solutions will be to use venture capitalists), but she is when it interferes with the greater social good. In this chapter, she also explains why the West has such a difficult time in its dealings with countries in the Middle East: we use an economics supermeme in trying to deal with a region that lives by a religious supermeme. One example of differing beliefs is that many countries in the Middle East, Pakistan and Iran among them, have outlawed charging interest on loans. She says, "Can we in the West imagine outlawing something as fundamental as the right to charge interest on a loan? Ridiculous!"
In a chapter called "Surmounting the Supermemes," she gives an example of what can be achieved when one is not locked into the accepted memes of an industry. She tells us the story of Muhammad Yunus who, in 2006, won the Nobel Prize for perfecting and popularizing microfinance. Whereas normal banks operate under the beliefs/memes that it's a waste of time and money to make small loans; loans should only be made to individuals so they can be held accountable; and since poor people are so desperate they can be charged more interest and, therefore, should be; Yunus made loans as small as $1.50; charged very low rates of interest; and loaned, mostly, to groups of five or six people, recognizing that people might not feel bad about defaulting to a faceless banking institution, but wouldn't want to leave their friends and peers holding the bag. Using his own ideas rather than following banking memes without thinking, his Grameen Bank has loaned more than $6 billion (U.S.) and boasts a staggering 97% repayment rate.
And now, finally, Costa arrives at her solutions.
1. Implied in the entire book is the notion that we should monitor our memes and continually evaluate whether they're true or not.
2. Additionally, presidents should get independent, scientific counsel on a frequent basis in behind-closed-door meetings (so that the scientists can speak freely) as presidents Truman through Kennedy used to do, until Nixon ended the practice.
3. We should use the venture capital model where many ideas are invested in simultaneously to see what works or not.
4. Each of us should be developing our insight. In fact, she devotes her final two chapters to this topic--"Bridging the Gap: Building Better Brains," and "Invoking Insight: Conditions Conducive to Cognition."--which implies that she thinks developing insight is the most important solution of them all and, thus, the subtitle of the book: "Thinking Our Way Out of Extinction."
I actually agree with the majority of Costa's discussions on the supermemes. The problem comes in her main focus of insight as the solution. But lack of insight isn't the problem. As she herself shows, we have many people around the world who have and continue to come up with insightful solutions to problems. One of the real problems is one she never even addresses: that of vested interests, the issue of personal gain over public good. (It's only hinted at in the extreme economics chapter.) Take the NASA example mentioned above, for example. Is it possible that the heads of oil, coal, and nuclear energy wouldn't want this cheap energy made available to the public because their personal profits would decrease?
Additionally, if, as she claims earlier in the book that the evolution of the brain is slow and technological progress is fast and evolution can't keep up with it (which is what leads to the "cognitive threshold"), then it doesn't make sense to do insight workouts. Because either insight is something dependent upon evolution or it can be developed through effort, exercise, and diet, etc. The two arguments contradict each other.
I like her first solution, about the scientists, but we can see how that closed door policy was so easily corrupted when presidents began to take more meetings with corporate lobbyists than scientists. The "try lots of solutions simultaneously venture capital model" could work on some problems, but others are complex enough that a whole bunch of solutions at once could interact with each other in counterproductive ways.
In fact, this leads me to one of the main problems I have with the book: the supermemes chosen feel a tiny bit arbitrary. Huge problems that don't get mentioned in this format are 1) (as other reviewers have brought up) overpopulation, 2) vested interests and disinformation campaigns, 3) sheer ignorance (often religion-based) about the importance of keeping the planet healthy, and 4) the focus on principles rather than consequences. It wouldn't be difficult to think of the memes that lead to these conditions.
As much as her memes might be correct so far as they go, each of us individually developing insight is not going to solve the above problems. The only way this book can help is if the greedy and the ignorant read it and question and change their views. But as usually happens, the people who most need it would be the least likely to read it.
The book is highly readable and phrased in as non-partisan way as possible so I would recommend it even if I wish it offered a solution that was more guaranteed to work.
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The Weather Makers: How Man Is Changing the Climate and What It Means for Life on Earth Review

The Weather Makers: How Man Is Changing the Climate and What It Means for Life on Earth
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The Weather Makers: How Man Is Changing the Climate and What It Means for Life on Earth Review"Not another book on climate change!", you lament. Readers may feel surfeited by the rash of books on "global warming" appearing in the past few years. The feeling is understandable. The situation should be considered an indication of how serious the problem is for all humanity. In this case, the author introduces a little-considered aspect. Tim Flannery, whose keen eye and bountiful wit always offers something new presented in a easily readable way, will not leave you jaded nor have your head nodding in ennui. Although Flannery does address some questions dealt with elsewhere, he adds the most significant topic of all - the future of life.
As a zoologist, Flannery has extensive field experience in the forests of New Guinea and elsewhere. He's written of human impact on large animals in North America and Australia. Here, he writes of human impact on all life. Instead of hunting animals to extinction, humans are modifying the entire biosphere through pollutants and gases. This indirect imposition has already killed off at least one species, he demonstrates. In explaining how the Golden Toad went extinct, Flannery sets the scene expansively. The Toad wasn't just a local phenomenon, but died out due to wide-ranging changes in ocean temperature, air mass movements and changes in rainfall. This combination of influences resulted in what appeared to us as a minimal change in habitat. To the Golden Toad, that "minimal change" proved catastrophic. The object lesson is clear. How much change will the species humans rely on for survival tolerate? Flannery, citing James Lovelock's "Gaia" hypothesis of the biosphere as a tightly woven "system", argues that the tolerance for change is meagre. And human-induced change is squeezing the tolerance downward. Up to 30% of all major species are under threat of extinction during this century.
Flannery notes how much needs to be learnt about our impact on the biosphere. Only a generation ago we had identified half of the "greenhouse gases" and scientists still contested whether their influence would warm or cool the planet. Now, he stresses, the warming effect is clearly dominant. The result of that warming is unfolding before us right now. More significantly, the consequences of today's conditions will not be fully realised for a generation. When they become apparent they will be far too severe to reverse. The time to take preventive action is now, not in a decade or more. The reason for prompt action refutes the "climate sceptics" who argue that climate change is "natural" and requires adaptability, not severe crisis-preventing action. Flannery explains how this view is mistaken and misleading. The rate of change today far exceeds any past natural process, and its effects may last many millennia. All examples of past climate change show cascading processes, where one small change induces later, more complex or far-reaching results. With today's rate of change so rapid, Flannery argues, the cumulative effects are unpredictable. But they won't be pleasant.
Flannery's presentation is that of the convinced scientist and caring individual. His abilities as a science writer provide us with clearly spelled out conditions and solutions. He is an ardent supporter of personal steps to be taken to reduce that rate of change underway around us. He also shows how industries and governments can contribute to slowing the threat to our biosphere and thus, our children's future. In fact, just about the only negative thing that can be said about this book is its chaotic "References" section. There is a logic in there somewhere, but in this reviewer's opinion, it's to make you go back to the text to cross-check and relearn the point. [stephen a. haines - Ottawa, Canada]The Weather Makers: How Man Is Changing the Climate and What It Means for Life on Earth Overview

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