Category: Energy/Environment

Easter Island Was Ravaged by Rats, Peruvian Slaving Parties and Nonnative Diseases, Not by Ecocide

Statues-That-WalkedBK.jpg

Source of book image: http://0.tqn.com/d/archaeology/1/0/g/L/1/Statues-That-Walked-sm.jpg

The natives call Easter Island “Rapa Nui.”

(p. C5) With the forest gone, Rapa Nui’s soil degraded; unable to feed themselves, Mr. Diamond argued in his best-selling “Collapse” (2005), Easter Islanders faced “starvation, a population crash, and a descent into cannibalism.” The fall was abrupt and overwhelming; scores of giant statues were abandoned, half-finished. Roggeveen had discovered a ruin–and a powerful eco-parable.

Books and articles by the hundred have pointed to Rapa Nui as the inevitable result of uncontrolled population growth, squandered resources and human fecklessness. “The person who felled the last tree could see it was the last tree,” wrote Paul G. Bahn and John Flenley in “Easter Island, Earth Island” (1992). “But he (or she) still felled it.” “The parallels between Easter Island and the whole modern world are chillingly obvious,” Mr. Diamond proclaimed. “The clearest example of a society that destroyed itself by overexploiting its own resources,” he said, Rapa Nui epitomizes “ecocide,” presenting a stark image of “what may lie ahead of us in our own future.”
No, it doesn’t, write archaeologists Terry Hunt and Carl Lipo in “The Statues That Walked,” a fascinating entry in the pop-science genre of Everything You Know Is Wrong. Messrs. Hunt and Lipo had no intention of challenging Mr. Diamond when they began research on Rapa Nui. But in their fourth year of field work, they obtained radiocarbon dates from Anakena Beach, thought to be the island’s oldest settlement. The dates strongly indicated that the first settlers appeared around A.D. 1200–eight centuries later than Heyerdahl and other researchers had thought.
Wait a minute, the authors in effect said. Rapa Nui is so remote that researchers believe it must have been settled by a small group of adventurers–a few dozen people, brave or crazy, in boats. The new evidence suggested that their arrival had precipitated catastrophic deforestation “on the scale of decades, not centuries.” The island then probably had only a few hundred inhabitants. Some ecologists estimate that the island originally had 16 million palm trees. How could so few people have cut down so much so fast?
. . .
The real culprit, according to “The Statues That Walked,” was the Polynesian rat (Rattus exulans), which stowed away on the boats of the first Polynesian settlers. In laboratory settings, Polynesian rat populations can double in 47 days. Throw a breeding pair into an island with no predators and abundant food and arithmetic suggests the result: ratpocalypse. If the animals multiplied as they did in Hawaii, the authors calculate, Rapa Nui would quickly have housed between two and three million. Among the favorite food sources of R. exulans are tree seeds and tree sprouts. Humans surely cleared some of the forest, but the real damage would have come from the rats that prevented new growth.
“Rather than a case of abject failure,” the authors argue, “Rapa Nui is an unlikely story of success.” The islanders had migrated, perhaps accidentally, to a place with little water and “fundamentally unproductive” soil with “uniformly low” levels of phosphorus, an essential mineral for plant growth. To avoid the wind’s dehydrating effects, the newcomers circled their gardens with stone walls known as manavai. Today, the researchers discovered, abandoned manavai occupy about 6.4 square miles, a tenth of the island’s total surface.
More impressive still, about half of the island is covered by “lithic mulching,” in which the islanders scattered broken stone over the fields. The uneven (p. C6) surface creates more turbulent airflow, reducing daytime surface temperatures and warming fields at night. And shattering the rocks exposes “fresh, unweathered surfaces, thus releasing mineral nutrients held within the rock.” Only lithic mulching produced enough nutrients–just barely–to make Rapa Nui’s terrible soil cultivable. Breaking and moving vast amounts of stone, the islanders had engineered an entirely new, more productive landscape.
Their success was short-lived. As Messrs. Hunt and Lipo point out, the 18th and 19th centuries were terrible times to reside in a small, almost defenseless Pacific nation. Rapa Nui was repeatedly ravaged by Peruvian slaving parties and nonnative diseases.
. . .
Easter Island’s people did not destroy themselves, the authors say. They were destroyed.
. . .
Oral tradition said that the statues walked into their places. Oral tradition was correct, the authors say. By shaping the huge statues just right, the islanders were able to rock them from side to side, moving them forward in a style familiar to anyone who has had to move a refrigerator. Walking the statues, the authors show in experiments, needed only 15 or 20 people.
In a 2007 article in Science, Mr. Diamond estimated that hundreds of laborers were needed to move the statues, suggesting that the eastern settlements of the island alone had to have “a population of thousands”–which in turn was proof of the island’s destructive overpopulation. By showing that the statues could have been moved by much fewer people, Messrs. Hunt and Lipo have removed one of the main supports of the ecocide theory and the parable about humankind it tells.

For the full review, see:
CHARLES C. MANN. “Don’t Blame the Natives; It was a rat that caused the sudden collapse of Easter Island’s civilization.” The Wall Street Journal (Sat., JULY 30, 2011): C5-C6.
(Note: ellipses added; italics in original.)

Source of book under review:
Hunt, Terry, and Carl Lipo. The Statues That Walked: Unraveling the Mystery of Easter Island. New York: Free Press, 2011.

Nuclear Energy Much Safer than Previously Thought

(p. A14) ROCKVILLE, Md. — The Nuclear Regulatory Commission is approaching completion of an ambitious study that concludes that a meltdown at a typical American reactor would lead to far fewer deaths than previously assumed.

The conclusion, to be published in April after six years of work, is based largely on a radical revision of projections of how much and how quickly cesium 137, a radioactive material that is created when uranium is split, could escape from a nuclear plant after a core meltdown. In past studies, researchers estimated that 60 percent of a reactor core’s cesium inventory could escape; the new estimate is only 1 to 2 percent.
. . .
Big releases of radioactive material would not be immediate, and people within a 10-mile radius would have enough time to evacuate, the study found. The chance of a death from acute radiation exposure within 10 miles is therefore near zero, the study projects, although some people would receive doses high enough to cause fatal cancers in decades to come.
One person in every 4,348 living within 10 miles would be expected to develop a ”latent cancer” as a result of radiation exposure, compared with one in 167 in previous estimates.
”Accidents progress more slowly, in some cases much more slowly, than previously assumed,” Charles G. Tinkler, a senior adviser for research on severe accidents and one of the study’s authors, said in an interview at a commission office building here. ”Releases are smaller, and in some cases much smaller, of certain key radioactive materials.”

For the full story, see:
MATTHEW L. WALD. “N.R.C. Lowers Estimate of How Many Would Die in Meltdown.” The New York Times (Sat., July 30, 2011): A14.
(Note: ellipsis added.)
(Note: the online version of the article is dated July 29, 2011.)
(Note: I am not sure the whole article appeared on p. A14—only saw the online version.)

Solyndra Debacle Illustrates Why Feds Should Not Pick Tech Winners

The clip above is embedded from the Jon Stewart “The Daily Show” episode that was aired on Thurs., September 15, 2011.

Government “industrial policy” is likely to fail for many reasons. One is that the government decision makers are unlikely to know which future technologies will turn out to be the best ones. Another reason is that even if they know, government decision makers often decide based on what is politically expedient or what is beneficial to their friends.

Solyndra is a case in point, as Jon Stewart hilariously reveals.

Natural Causes of Rapid Temperature Change

(p. C4) Some three decades after Laki, 1816 was known as the “year without a summer” thanks to a big eruption in Indonesia. Even Mount Pinatubo in the Philippines in 1991 caused a brief, though small, drop in world temperatures.

Other abrupt coolings have been bigger but less explicable. Earlier this year, two scientists from Brown University used lake sediments to conclude that the sharp cooling in Greenland during the late Middle Ages, which extinguished the Norse colonies, saw temperatures drop by seven degrees Fahrenheit in 80 years, much faster than recent warming there. Conversely, Greenland’s temperature shot up by around 13 degrees in 50 years as the world came out of the last ice age 12,000 years ago and the ice sheets of North America and northern Europe retreated–again, unlike today’s slow increase.

For the full commentary, see:
MATT RIDLEY. “MIND & MATTER; Will Volcanoes Cool Our Warming Earth?” The Wall Street Journal (Sat., AUGUST 6, 2011): C4.

Gas Lighting Did Not Appeal to Those Who Had Servants to Light Their Candles

(p. 123) Gas was particularly popular in America and Britain. By 1850 it was available in most large cities in both countries. Gas remained, however, a (p. 124) middle-class indulgence. The poor couldn’t afford it and the rich tended to disdain it, partly because of the cost and disruption of installing it and partly because of the damage it did to paintings and precious fabrics, and partly because when you have servants to do everything for you already there isn’t the same urgency to invest in further conveniences. The ironic upshot, as Mark Girouard has noted, is that not only middle-class homes but institutions like lunatic asylums and prisons tended to be better lit – and, come to that, better warmed – long before England’s stateliest homes were.

Source:
Bryson, Bill. At Home: A Short History of Private Life. New York: Doubleday, 2010.

Cougar Dies in Connecticut Three Months AFTER Government Declares It Extinct

(p. A19) Boulder, Colo.
You have to admit, the cat had moxie.
The 140-pound cougar that was spotted last month among the estates of Greenwich — and was later struck and killed on the Wilbur Cross Parkway — has been the talk of southern Connecticut. New England, along with most of the Eastern United States, hasn’t been cougar country since the 19th century, when the animals were exterminated by a killing campaign that started in colonial times. So where had this cougar come from?
Now we know the answer, and it couldn’t be more astonishing. Wildlife officials, who at first assumed the cat was a captive animal that had escaped its owners, examined its DNA and concluded that it was a wild cougar from the Black Hills of South Dakota. It had wandered at least 1,500 miles before meeting its end at the front of an S.U.V. in Connecticut. That is one impressive walkabout.
You have to appreciate this cat’s sense of irony, too. The cougar showed up in the East just three months after the Fish and Wildlife Service declared the eastern cougar extinct, a move that would exempt the officially nonexistent subspecies of the big cat from federal protection. Perhaps this red-state cougar traveled east to send a message to Washington: the federal government can make pronouncements about where cougars are not supposed to be found, but a cat’s going to go where a cat wants to go.

For the full commentary, see:
DAVID BARON “The Cougar Behind Your Trash Can.” The New York Times (Fri., July 29, 2011): A19.
(Note: the online version of the commentary is dated July 28, 2011.)

Resistance to New Technology

(p. 59) . . . , not everyone was happy with the loss of open hearths. Many people missed the drifting smoke and were convinced they had been healthier when kept “well kippered in wood smoke,” as one observer put it. As late as 1577, a William Harrison insisted that in the days of open fires our heads did never ake.” Smoke in the roof space discouraged nesting birds and was believed to strengthen timbers. Above all, people complained that they weren’t nearly as warm as before, which was true. Because fireplaces were so inefficient, they were constantly enlarged. Some became so enormous that they were built with benches in them, letting people sit inside the fireplace, almost the only place in the house where they could be really warm.

Source:
Bryson, Bill. At Home: A Short History of Private Life. New York: Doubleday, 2010.
(Note: ellipsis added.)

Cow Burps and Farts Cause 28% of Methane Release “Due to Human Activity”

(p. 6A) LOS ANGELES — Scientists have isolated a bacterium from the gut of Australian Tam­mar wallabies that allows the animals to consume and digest grasses, leaves and other plant material without producing co­pious amounts of methane, as cattle do.
The microbe was discovered through a process described in a report published online recently by the journal Science.
Ultimately, the microbe might be put to use to reduce the car­bon footprint of cows and other ruminants, said report co-author Mark Morrison, a microbial bi­ologist in St. Lucia, Queensland.
. . .
The methane-rich burps and flatulence of cattle have been blamed for 28 percent of that greenhouse gas’s global emis­sions due to human activity. Like other cud-chewing mammals, they produce methane as their systems work to break down and ferment the plant matter they eat.

For the full story, see:
THE LOS ANGELES TIMES. “Wallaby microbe may one day help cut cows’ methane footprint.” Omaha World-Herald (Monday, July 4, 2011): 6A.
(Note: ellipsis added.)

Medieval Pollution

(p. 58) One thing that did not escape notice in medieval times was that nearly all the space above head height was unusable because it was so generally filled with smoke. An open hearth had certain clear advantages–it radiated heat in all directions and allowed people to sit around it on all four sides–but it was also like having a permanent bonfire in the middle of one’s living room. Smoke went wherever passing drafts directed it–and with many people coming and going, and all the windows glassless, every passing gust must have brought somebody a faceful of smoke–or otherwise rose up to the ceiling and hung thickly until it leaked out a hole in the roof.

Source:
Bryson, Bill. At Home: A Short History of Private Life. New York: Doubleday, 2010.

“People Condemned to Short Lives and Chronic Hardship Are Perhaps Unlikely to Worry Overmuch about Decor”

If “necessity is the mother of invention,” then why did it take so long for someone to invent the louvered slats mentioned at the end of this passage?

(p. 55) In even the best homes comfort was in short supply. It really is extraordinary how long it took people to achieve even the most elemental levels of comfort. There was one good reason for it: life was tough. Throughout the Middle Ages, a good deal of every life was devoted simply to surviving. Famine was common. The medieval world was a world without reserves; when harvests were poor, as they were about one year in four on average, hunger was immediate. When crops failed altogether, starvation inevitably followed. England suffered especially catastrophic harvests in 1272, 1277, 1283, 1292, and 1311, and then an unrelievedly murderous stretch from 1315 to 1319. And this was of course on top of plagues and other illnesses that swept away millions. People condemned to short lives and chronic hardship are perhaps unlikely to worry overmuch about decor. But even allowing for all that, there was just a great, strange slowness to strive for even modest levels of comfort. Roof holes, for instance, let smoke escape, but they also let in rain and drafts until somebody finally, belatedly invented a lantern structure with louvered slats that allowed smoke to escape but kept out rain, birds, and wind. It was a marvelous invention, but by the time it (p. 56) was thought of, in the fourteenth century, chimneys were already coming in and louvered caps were not needed.

Source:
Bryson, Bill. At Home: A Short History of Private Life. New York: Doubleday, 2010.

Medieval Halls of the Rich Incubated Plague in a Nest of “Filth Unmentionable”

(p. 51) In even the best houses, floors were generally just bare earth strewn with rushes, harboring “spittle and vomit and urine of dogs and men, beer that hath been cast forth and remnants of fishes and other filth unmentionable,” as the Dutch theologian and traveler Desiderius Erasmus rather crisply summarized in 1524. New layers of rushes were laid down twice a year normally, but the old accretions were seldom removed, so that, Erasmus added glumly, “the substratum may be unmolested for twenty years.” The floors were in effect a very large nest, much appreciated by insects and furtive rodents, and a perfect incubator for plague. Yet a deep pile of flooring was generally a sign of prestige. It was common among the French to say of a rich man that he was “waist deep in straw.”

Source:
Bryson, Bill. At Home: A Short History of Private Life. New York: Doubleday, 2010.