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The Sixth Extinction: An Unnatural History

From Wikipedia, the free encyclopedia

"The Sixth Extinction" redirects here. For other uses, see Sixth Extinction (disambiguation).

The Sixth Extinction: An Unnatural History
Image of the book jacket cover
AuthorElizabeth Kolbert
Country
  • United States
  • United Kingdom
LanguageEnglish
Subject
GenreNonfiction popular science
Published2014 (Henry Holt and Company)
Media typePrint
Pages319
ISBN978-0-8050-9299-8
576.8/4
LC ClassQE721.2.E97 K65 2014

The Sixth Extinction: An Unnatural History is a 2014 non-fiction book written by Elizabeth Kolbert and published by Henry Holt and Company. The book argues that the Earth is in the midst of a modern, man-made, sixth extinction. In the book, Kolbert chronicles previous mass extinction events, and compares them to the accelerated, widespread extinctions during our present time. She also describes specific species extinguished by humans, as well as the ecologies surrounding prehistoric and near-present extinction events. The author received the Pulitzer Prize for General Non-Fiction for the book in 2015.[1]

The target audience is the general reader, and scientific descriptions are rendered in understandable prose. The writing blends explanations of her treks to remote areas with interviews of scientists, researchers, and guides, without advocating a position, in pursuit of objectivity. Hence, the sixth mass extinction theme is applied to flora and fauna existing in diverse habitats, such as the Panamanian rainforest, the Great Barrier Reef, the Andes, Bikini Atoll, city zoos, and the author's own backyard. The book also applies this theme to a number of other habitats and organisms throughout the world. After researching the current mainstream view of the relevant peer-reviewed science, Kolbert estimates flora and fauna loss by the end of the 21st century to be between 20 and 50 percent "of all living species on earth".[2][3][4][5][6][7]

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Transcription

[MUSIC] The California Golden Bear The Great Auk The Passenger pigeon The Tasmanian tiger The Pinta Island tortoise The Golden toad All dead. And the killer is right there in the room with you. [MUSIC] The walls of France’s Lascaux cave hold some of humankind’s earliest art, almost mythical species: a wooly rhinoceros, enormous-antlered Megaloceros elk and massive aurochs. The artists lived on, but those cave walls are the last place that those animals still run. They’re gone. Extinct. We all pretty much understand extinction, it’s when a species kicks the proverbial bucket, it rides off into the great biological sunset, bites the dust from whence it came and shall return, which is all just a pretty way of saying that every last one of them dies. Even kids are used to the idea that sometimes groups of living things just… don’t exist anymore. Okay, mostly don’t exist. But extinction, as a thing, is a surprisingly new concept. In the 1790’s, by studying various fossils, naturalist George Cuvier was the first to show that they were not from living, yet undiscovered creatures, as many thought, but from what he called “lost species”. In the decades to come, scientists like Charles Lyell and ol' Chuck Darwin began to popularize the idea that Earth’s processes, like geology, evolution, and even extinction, did occur, just very, very, verrrry slowly. So slowly that we’d surely never actually see something go extinct. The idea of so-called catastrophic change was just impossible… It wasn’t until the 1980’s that scientists were able to shake that idea. Geologist Walter Alvarez was puzzled by the sudden disappearance of tiny aquatic fossils between two rock layers that dated from about 66 million years ago, the same age as the last dinosaurs. With the help of his Nobel Prize winning father, he analyzed the chemistry of that boundary and found iridium levels that were off the charts. Now, there’s usually not much iridium in Earth’s crust, but it’s very common in asteroids. So Alvarez’s theory? A 10-km wide rock collided with Earth, wiping out 75% of Earth’s plants and animals. To be honest scientists kinda laughed at it… until the 1991 discovery of the Chicxulub crater near the Yucatan peninsula finally settled it. Everything alive today is a descendent of a survivor of that terrible, horrible, no good, very bad day, the so-called Cretaceous-Paleogene mass extinction event, the most recent of the Big 5. You should feel pretty lucky. When we look at all of Earth’s fossil record together, 98% of the species that have ever lived are extinct,. Only they haven’t always disappeared at a constant rate. In the history of life on Earth, we know of 5 different mass extinctions, when a majority of life on Earth at the time disappeared in the blink of a geologic eye. Besides the most recent dino-killer, there’s the Triassic-Jurassic, Late Devonian, Ordivician-Silurian, and the worst of all, the End Permian. This mother of mass extinctions wiped out as many as 96% of Earth’s species, so it got the best nickname: The Great Dying. We’ve learned about all these just in time to get some bad news: We are in the 6th mass extinction, and this time, we are the asteroid. The hard facts of life mean that even when things are going pretty well on Earth, there’s a background rate of extinction. Among mammals, for instance, we’d expect to see one species to go extinct every 700 years, or maybe one amphibian every thousand years. Studies of current extinction rates say we’re roughly one thousand times past that, and in some groups, like amphibians, are disappearing forty-five thousand times faster than normal. And since there are so many species still unknown or uncharacterized, all of those numbers are probably underestimates. Goodbye, gastric brooding frog, Pyrenean ibex, the Fomosan clouded leopard. We could have been friends. So how do we know we’re to blame? Around 13,000 years ago, as Earth thawed from its most recent big freeze, all of our favorite weird megafauna like the wooly mammoth, Smilodon, and our old friend Megatherium disappeared from the Earth, thanks to a changing climate and the invention of sharp stabby hunting tools. I really wish we had saved the 8-foot long beaver though. That would be awesome. Along the way, through hunting and farming, humans have been altering ecosystems in small but significant ways, but since the Industrial Revolution, man we have really kicked it into overdrive. With the exception of maybe the first bacteria to breathe oxygen into the air, no living thing has ever altered life on Earth to the degree that we have, which is why scientists now refer to current epoch as the Anthropocene. "We are the ultimate problem. There are 7 billion people on the planet, we tend to destroy critical habitats where species live, we tend to be warming the planet, we tend to be very careless about moving species around the planet." According to a 2014 paper by Stuart Pimm in Science (link in the doobly do), the main cause of the current extinction is human population growth and increased consumption. But those two things lead to a whole mess of threats: The most obvious are climate change and habitat destruction. Scientists found that most land species have very small ranges, so they can’t just pack up and move when we cut down their forest or turn it into a desert. Ocean species have more freedom to move to better waters, unless they’re coral reefs, but thanks to the highest atmospheric CO2 concentrations in 800,000+ years turning the oceans more acidic, anything with a calcium based shell has nowhere to run… or swim. If current trends hold up and the ocean hits pH 7.8 by end of century, it could wipe out ⅓ of the species in the ocean. Then there’s the invaders! Thanks to a species of snake hitching a ride on military cargo in the 1940s, Guam has lost all of its native birds. "I have had it with these (invasive) snakes on this (Guam-bound cargo) plane" In Africa’s Lake Victoria, 100s of species of cichlid fish species vanished after fishermen introduced the Nile Perch. Go us! We’re erasing species faster than we can even name them. Stanford’s Rodolfo Dirzo says that in the past 40 years, invertebrate populations, which might make up 97% of species on Earth, have declined 45% worldwide, and that’s just the ones we know about. (Link in the doobly do to that one too) You have to feel worst for the amphibians. Over the past 350 million years, they’ve survived multiple mass extinctions, but this time we’re giving them all we’ve got. Dirzo gives this loss of animal life a rather harmless sounding name: Defaunation. But there is nothing cute about it. There is not a group of living things on Earth today that is not threatened by the current and coming extinction. That includes us. Extinction is about more than gorillas, tigers, polar bears, and rhinos, and the dozens of other “famous” or “charismatic” species out there. Those are all important and worth saving, but we need to care just as much about the humble beetles, the ugly little worms, and the slimy frogs. Every species, big or small, panda or protozoa, is important and worth saving, whether or not we understand exactly why it’s worth saving. John Muir once said, “When we try to pick out anything by itself we find that it is bound fast by a thousand invisible cords that cannot be broken, to everything in the universe.” I’ve put some links down in the description where you can get to know some of Earth’s less-loved endangered species. Go make friends with one. Our knowledge and understanding of the planet’s ecosystems may be incomplete, but our effect on them knows no bounds. I hope the same tools and technology that we’ve used to push life on Earth to the edge might also give us power to bring ‘em back. So what are we gonna do? Let’s talk about it down there. Stay curious. If you want to read more about the brilliant and tragic stories of extinction in this age of humans, check out "The Sixth Extinction" by Elizabeth Kolbert, link in the description.

Anthropocene

Main article: Anthropocene

Kolbert equates current, general unawareness of this issue to previous widespread disbelief of it during the centuries preceding the late 1700s; at that time, it was believed that prehistoric mass extinctions had never occurred. It was also believed there were no natural forces powerful enough to extinguish species en masse. Likewise, in our own time, the possible finality presented by this issue results in denialism. But scientific studies have shown that human behavior disrupts Earth's balanced and interconnected systems, "putting our own survival in danger." Consequently, the Earth systems currently affected are: the global atmosphere, the water cycle, the ocean's heat absorption, ocean acidity (and its effect on coral reefs), soil moisture and drought conditions, plant destruction by pests/non-indigenous fauna or heat stress, heat regulation by the Earth's ice, and so on.

The human species contributes to this disruption – even without intending to – because of our innate capabilities to alter the planet at this stage of our cultural evolution; for instance, we now have the ability to harness energy from beneath the Earth's surface. Homo sapiens also have the ability to adapt relatively quickly to almost any environment on this planet's surface. Other species, however, have a hard time relocating to new, suitable habitats. They are unable to migrate ahead of current rapid ecological changes, or are hampered by artificial barriers such as roadways, cityscapes, and suburban sprawl, which increase discontinuity between viable habitats throughout the world.[2][3][4][5][6]

Background

Elizabeth Kolbert is a science writer for The New Yorker magazine. She is the author of Field Notes from a Catastrophe, as well as several other books. Her writing focuses on the effects of humans and civilization on our planet's ecosystem. Much of her writing involves her experiences of various locations, as noted above. Previously, she was a reporter for The New York Times.[2][4] Kolbert resides in Williamstown, Massachusetts, with her husband and children, and she writes in her home office across from Mount Greylock in Massachusetts.[8] Pertaining to this book, Kolbert has been interviewed by national news and media organizations.[9][10][11][12][13]

Kolbert's decision to write this book was influenced by a 2008 Proceedings of the National Academy of Sciences paper, titled, "Are we in the midst of the sixth mass extinction? A view from the world of amphibians". Subsequently, Kolbert wrote an article for The New Yorker, titled (similarly to her eventual book), "The Sixth Extinction?"[14] Researching this article involved amphibian-hunting in Panama. She then realized, "I hadn't scratched the surface, that there was a book there."[7][15]

Summary of chapters

Chapter 1: The Sixth Extinction

The ancestors of frogs crawled out of water around 400 million years ago. 250 million years ago, frogs were the earliest representation of what would become the modern amphibian orders. Amphibians have been on Earth for longer than mammals or birds; they were even here before dinosaurs. Recently, it has been reported that the extinction rate of frogs is increasing. Based on observed extinction rates far beyond expected background extinction rates, we can predict that an event of a catastrophic nature is headed our way.[16] A decade ago, Panamanian golden frogs were plentiful in numbers and easy to find around Panama. However, within the past couple of years, the frogs started to disappear. Kolbert states that studies by the National Zoological Park in Washington, DC, and a mycologist at the University of Maine, have identified the reason for the increased mortality of Panamanian frogs as a type of Chytrid fungus.[17] However, Chytrid fungi are not naturally found in Panama. This left a puzzling question: how did the fungus get to Panama? Evidence indicates that humans were instrumental in how the fungus traveled. Kolbert uses the frog-fungus relationship as a symbol of how humans are introducing invasive species to various environments, where native species would normally have the proper distribution of alleles for their environment.

Chapter 2: The Mastodon's Molars

Kolbert explains how fossils of the American mastodon (Mammut americanum) shaped Georges Cuvier's views on catastrophism. According to Cuvier, there was no reason the mastodon should have died out. The mastodon was large enough to avoid predation, had large enough teeth to consume an abrasive diet, and had other phenotypes that should have increased its chances of survival. Cuvier concluded there must have been sudden and violent natural catastrophes that caused mass extinctions of viable species.[18] Kolbert uses the mastodon as a symbol for the idea that catastrophe is an important mechanism of extinction.

Chapter 3: The Original Penguin

The great auk was a large flightless bird that lived in the Northern Hemisphere. It had a large, intricately grooved beak. When the first settlers arrived in Iceland, the auk population was probably in the millions. However, the settlers found the auks to be “very good and nourishing meat.” They also used their oily bodies for fuel and fish bait, and their feathers for stuffing mattresses.[19] Despite attempts at protecting the species, by 1844, the last auks were killed. Kolbert uses the great auk as a symbol of how human overexploitation of resources is another important mechanism of extinction.

Chapter 4: The Luck of the Ammonites

Kolbert explains that the main cause of the Cretaceous–Paleogene extinction event was not the impact of the asteroid itself. It was the dust created by the impact. The debris from the impact incinerated anything in its path.[20] She states that it is impossible to estimate the full extent of the various species that died out due to this catastrophe. However, one class of animals we know did die out because of the effects of the asteroid's impact, are the ammonites. Kolbert explains that, even though ammonites were 'fit' for their current environment, a single moment can completely change which traits are advantageous and which are lethal.[21]

Chapter 5: Welcome to the Anthropocene

Kolbert uses the extinction of graptolites and other clades to explain glaciation as a mechanism for extinction. She then explains how, when carbon dioxide levels in the air are high, there typically is accompanying increase in temperatures and sea level. Right around the time graptolites became extinct, carbon dioxide levels dropped. Temperatures fell and sea levels plummeted. This caused a change in the chemistry of the ocean, which had a devastating impact on life forms.[22] Kolbert states that human activity has transformed between a third and a half of land surface on the planet. We have dammed most of the major rivers of world, increased levels of nitrogen higher than can be fixed naturally by terrestrial ecosystems, used more than half of the world's readily accessible freshwater run-off, removed more than one third of the primary producers of the oceans' coastal waters, and changed the composition of the atmosphere by deforestation and fossil fuel combustion.[23]

Chapter 6: The Sea Around Us

Since the beginning of the Industrial Revolution, we have seen increasing levels of carbon dioxide in the atmosphere at an alarming rate. Studies show we have added approximately 365 billion tons of it by burning fossil fuels, and an additional 180 billion tons as a result of deforestation. We add another 9 billion tons or so a year, an amount that has been increasing by 6 percent annually. Essentially, we have increased the concentration of carbon dioxide in the air to higher than it has been in the last several million years.[24] Some of this carbon dioxide is being absorbed by our oceans to create carbonic acid. This is lowering the pH of our ocean and killing much of our marine life. Kolbert uses the drastic decline in life forms around the Castello Aragonese as a warning sign of what is to come if we continue to increase carbon dioxide levels in the atmosphere.[25]

Chapter 7: Dropping Acid

Coral reefs support thousands of species by providing food and protection. Subsequently, many species have co-evolved with corals. Due to ocean acidification, it is very possible that corals will become extinct by the end of the century. Prior to the industrial revolution, underwater reefs had an aragonite saturation state between 4 and 5. However, if current emission intensities remain as they are today, by 2060, there will no longer be a region above 3.5. This will lead to an increase in energy needed for calcification.[26] This extra energy that will eventually be expended on calcification is currently vital to corals, as they use it to recover from being eaten away by marine species and battered by waves. Thus, ocean acidification is a mechanism of extinction.

Chapter 8: The Forest and the Trees

Global warming is most commonly seen as a threat to cold-loving species. As temperatures rise, the ice at the North Pole and South Pole will melt. Any living thing that depends on the ice will be faced with extreme challenges that could ultimately drive them to extinction.[27] Kolbert points out that the poles are not the only places affected by global warming, and that other areas have much higher latitudinal diversity gradients. She discusses the work of scientists who have used measures of species-area relationship to model possible effects of global warming. The extent to which species are mobile and can relocate to new areas, in response to shifting climate conditions, is predicted to be a significant factor in possible species extinction. This has particular importance for trees and other plant species. Even more difficult to estimate is the extent to which ecological communities of species will be able to tolerate disruptive changes.[28]

Chapter 9: Islands on Dry Land

Kolbert points out how everything in life is interconnected, and discusses the importance of patch dynamics. Over time, fragmentation of environmental areas leads to a decrease in the number of species in an area. This occurs, in part, because the size of such "islands" is too small to support a stable number of species members. Also, smaller populations are more vulnerable to these changing events. In addition, the disconnection of islands makes it more difficult for species to reach and recolonize them. One researcher describes this as "an obstacle course for the dispersal of biodiversity."[29]: 189  Kolbert also notes that the habits of many species can be highly specialized to their environment. She explains that one minor change can cause a domino effect in various ecological systems.[30][31][32]

Chapter 10: The New Pangaea

Kolbert points out that there is an evolutionary arms race, in which each species must be equipped to defend against their potential predators, and need to be more fit than their competition. A species has no defense if it encounters a new fungus, virus, or bacterium. This can be extremely deadly, as it was in the case of American bats killed by the psychrophilic fungus Geomyces destructans.[33] Another example of this occurred in the 1800s. The American chestnut was the dominant deciduous tree in eastern American forests. Then, a fungus (Cryphonectria parasitica) started to cause chestnut blight. It was nearly 100 percent lethal. This fungus was unintentionally imported to the US by humans.[34] Kolbert then explains that global trade and travel are creating a virtual "Pangaea", in which species of all kinds are being redistributed beyond historical geographic barriers. This furthers the first chapter's idea that invasive species are a mechanism of extinction.

Chapter 11: The Rhino Gets an Ultrasound

The Sumatran Rhino was once so abundant in numbers it was considered an agricultural pest. However, as Southeast Asia's forests were cut down, the rhino's habitat became fragmented. In the 1900s, the rhino population had been shrunk to just a few hundred. A captive breeding program was widely regarded as a failure and resulted in the deaths of several rhinos, and it was decades before a single baby was born. Today, there are only one hundred living Sumatran rhinos.[35] Kolbert uses this rhino species to illustrate habitat fragmentation as another mechanism of extinction.

Chapter 12: The Madness Gene

Europe was home to the Neanderthals for at least 100,000 years. Then, about 30,000 years ago, the Neanderthals vanished. Fossil records show that modern humans arrived in Europe 40,000 years ago. Within 10,000 years, Neanderthals were bred out.[36] Through molecular sequencing, scientists have found that there is one to four percent Neanderthal DNA in all non-African humans. This indicates that humans and Neanderthals interbred, and the resulting hybrids reproduced. The pattern continued until Neanderthals were literally bred out.[37] Kolbert states there is every reason to believe that Neanderthals would still exist if it weren't for Homo sapiens.

Chapter 13: The Things with Feathers

Kolbert concludes with hope in humanity, pointing to various efforts to conserve or preserve species. Whether meaning to or not, we are deciding which evolutionary pathways will be shut off forever, and which can be left open to flourish.

Sources

Some sources for the book include The Song of the Dodo by David Quammen, The Ghost With Trembling Wings by Scott Weidensaul, and reports from Edward O. Wilson, a biologist. The pioneering studies of naturalist Georges Cuvier and geologist Charles Lyell are also referenced. The book's title is similar to a 1995 book title, The Sixth Extinction: Patterns of Life and the Future of Humankind by Richard Leakey and Roger Lewin. Also included are excerpts from interviews of a forest ecologist, atmospheric scientist Ken Caldeira, wildlife and conservation experts, a modern-day geologist, and fungus research in New England and New York state.[4][6]

Awards and honors

Bill Gates named the book to his 2014 Summer Reading List.[42]

See also

References

  1. ^ http://www.pulitzer.org/citation/2015-General-Nonfiction Pulitzer citation
  2. ^ a b c Gore, Al (vice president of the United States from 1993 to 2001) (February 10, 2014). "Without a Trace. 'The Sixth Extinction,' by Elizabeth Kolbert". New York Times Sunday Book Review. New York City. Retrieved July 10, 2014.{{cite news}}: CS1 maint: numeric names: authors list (link)
  3. ^ a b Schulz, Kathryn (February 9, 2014). "The Sixth Extinction Examines Human Overkillers and the Next Great Die-Off". New York Magazine. New York City: New York Media. Archived from the original on February 11, 2019. Retrieved February 13, 2014.
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  5. ^ a b Hannibal, Mary Ellen (February 9, 2014). "Sixth Extinction". HuffPost. New York.
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  10. ^ "In The World's 'Sixth Extinction,' Are Humans The Asteroid?". NPR. February 12, 2014. Retrieved October 8, 2020.
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  19. ^ Gaskell, Jeeremy (March 15, 2001). Who Killed the Great Auk?. New York: Oxford University Press. p. 87. ISBN 978-0198564782.
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  26. ^ Fabricus, Katherina; Chris Langdon; Sven Uthicke; Craig Humphrey; Sam Noonan; Glenn De'ath; Remy Okazaki; Nancy Muehllehner; Martin S. Glass; Janice M. Lough (May 29, 2011). "Losers and Winners in Coral Reefs Acclimatized to Elevated Carbon Dioxide Concentrations". Nature Climate Change. 1 (3): 165–169. Bibcode:2011NatCC...1..165F. doi:10.1038/nclimate1122.
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  31. ^ Wright, Emma (December 9, 2010). "Army Ant Camp Followers". Conservation: The Environment and Food Security. Retrieved April 29, 2014.
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  35. ^ Welz, Adam (November 27, 2012). "The Dirty War Against Africa's Remaining Rhinos". Yale University Press.
  36. ^ Callaway, Ewen (2014). "Modern human genomes reveal our inner Neanderthal". Nature. doi:10.1038/nature.2014.14615. S2CID 87796857.
  37. ^ Alroy, John (1999). Putting North America's End Pleistocene Megafaunal Extinction in Context. New York: Kluwer Acdamix/Plenum. p. 138.
  38. ^ "National Book Critics Circle Announces Finalists for Publishing Year 2014". National Book Critics Circle. January 19, 2015. Archived from the original on January 22, 2015. Retrieved January 29, 2015.
  39. ^ "Library Journal's Best Books of 2014". lj.libraryjournal.com. Archived from the original on June 26, 2015. Retrieved December 4, 2016.
  40. ^ "Previous Winners". massbook.org. Massachusetts Center for the Book. Retrieved April 4, 2019.
  41. ^ "The 2015 Pulitzer Prize Winners: General Nonfiction". pulitzer.org. For a distinguished and appropriately documented book of nonfiction by an American author that is not eligible for consideration in any other category, Ten thousand dollars ($10,000). Awarded to "The Sixth Extinction: An Unnatural History," by Elizabeth Kolbert (Henry Holt), an exploration of nature that forces readers to consider the threat posed by human behavior to a world of astonishing diversity.
  42. ^ Gates, Bill (July 13, 2014). "6 books I'd recommend". Gates Notes. Retrieved October 8, 2020.

External links

External links below:

Kolbert

Miscellaneous


This page was last edited on 11 April 2024, at 00:17
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