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Study debunks popular climate myth about Easter Island 'ecocide'

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Study debunks popular climate myth about Easter Island 'ecocide'

A recently-published study challenges the popular myth that Easter Islanders’ ancient rock gardening practices caused their own downfall.

The journal article, which is titled “Island-wide characterization of agricultural production challenges the demographic collapse hypothesis for Rapa Nui,” was published in Science Advances on Friday. The study explains that Rapa Nui, also known as Easter Island, “is often used as an example of how overexploitation of limited resources resulted in a catastrophic population collapse.”

Hundreds of years ago, farmers on the island – located in the South Pacific – practiced “slash and burn” agriculture by tearing down palm trees and setting them on fire. Farmers would then practice rock gardening to help enrich their soil.

According to a popular myth, islanders were so focused on their rock farming – and erecting hundreds of gigantic stone statues – that their civilization collapsed. When Europeans discovered Easter Island in 1722, the island’s population was allegedly smaller than it once was.

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A recently-published study debunks a popular climate myth about Easter Islanders’ farming practices. (iStock)

“A vital component of this narrative is that the rapid rise and fall of pre-contact Rapanui population growth rates was driven by the construction and overexploitation of once extensive rock gardens,” the article’s abstract section explains. “However, the extent of island-wide rock gardening, while key for understanding food systems and demography, must be better understood.”

Contrary to popular belief that rock gardening was bad for soil, the study says that the practice “enhanced plant productivity by increasing available soil nutrients and maintaining soil moisture.”

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“Given the benefits rock gardening has for increasing soil productivity and, thus, plant growth, its practice was a vital part of pre-contact Rapanui subsistence,” the article states. “Nearly half of the Rapanui diet consisted of terrestrial foods.”

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This photo taken on April 5, 2024, shows Moai stone statues on Easter Island of Chile. Easter Island, known for its giant stone-carved heads facing out to sea, is located at the southernmost point of the Polynesian Triangle in the South Pacific, and is considered one of the world’s most remote inhabited regions.  (Zhu Yubo/Xinhua via Getty Images)

“In this regard, measuring the extent of rock gardens is critical for understanding the island’s pre-contact environmental carrying capacity.”

Researchers also used shortwave infrared (SWIR) satellite imagery and machine learning to determine that Easter Island’s population was likely smaller than previously claimed – challenging the myth that the island’s 1722 population was substantially smaller than it was hundreds of years earlier.

“Our estimates suggest that the maximum population supported by rock gardening is not ~17,000 as claimed through Ladefoged et al.’s rock gardening calculations but just 3901 using our measurements,” the study states.

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Despite research suggesting otherwise, the study’s authors acknowledge that the myth still remains popular outside of academia. 

Moais seen on the outer slopes of Rano Raraku volcanic crater. (John Milner/SOPA Images/LightRocket via Getty Images)

“Despite recent archaeological literature debunking ideas about Malthusian population overshoot, the premise that Rapanui society caused its own demise from unsustainable resource use and uncontrolled population increases has been widely popularized,” the article states. 

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“While many researchers working on the island have shifted their narratives away from the assumptions of a pre-European collapse, the story remains prominent in disciplines such as ecology, paleoecology, and mathematics.”

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Map: 3.8-Magnitude Earthquake Shakes Las Vegas

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Map: 3.8-Magnitude Earthquake Shakes Las Vegas

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Note: Map shows the area with a shake intensity of 3 or greater, which U.S.G.S. defines as “weak,” though the earthquake may be felt outside the areas shown.  All times on the map are Pacific time. The New York Times

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A minor, 3.8-magnitude earthquake struck in Nevada on Thursday, according to the United States Geological Survey. The earthquake prompted a flurry of chatter online, but no widespread damage was reported.

The temblor happened at 1:47 p.m. Pacific time about 7 miles northwest of Summerlin South, Nev., data from the agency shows.

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On social media, residents across the area described the earthquake jolting their homes and rattling windows and doors. Some said they heard the boom-like sound of an explosion, while others said they didn’t feel anything or described a small disturbance that lacked any significant oomph.

Brian Cohen was at home putting away groceries in Lone Mountain, about a half hour west of the Las Vegas strip, just before 2 p.m. when he felt the entire house rattle intensely for about three seconds.

“The whole house felt like it was lifting up,” said Mr. Cohen, who is in his 60s. He went outside and saw a neighbor, who also reported feeling the jolt.

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Mr. Cohen, who has lived in the Las Vegas area since 1994, said this wasn’t his first earthquake. “This one is the strongest one I felt,” he said, adding there was no damage to his home.

As seismologists review available data, they may revise the earthquake’s reported magnitude. Additional information collected about the earthquake may also prompt U.S.G.S. scientists to update the shake-severity map.

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Aftershocks forecast

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While individual earthquakes can’t be predicted, geologists can calculate the chances that more earthquakes will follow an initial quake using statistical models of past events.

For this earthquake, it is unlikely — about a 4 chance — that a larger quake will strike the area in the next day, according to the U.S.G.S. Here is the forecast for aftershocks of other sizes:

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3.0 mag. or stronger

Perhaps

26%

4.0 mag. or stronger

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Unlikely

5%

5.0 mag. or stronger

Unlikely

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Source: United States Geological Survey. Data is as of June 4 at 1:57 p.m. Pacific time.  Chance of aftershocks typically decreases over time. Forecast quake counts are estimates. William B. Davis, Joel Eastwood and John Keefe/The New York Times

The rate of aftershocks typically decreases over time, and forecasts are available for the next week, month and year.

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Aftershocks detected

Subsequent quakes have been reported in the same area. Such temblors are typically aftershocks caused by minor adjustments along the portion of a fault that slipped at the time of the initial earthquake.

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Quakes and aftershocks within 100 miles

Aftershocks can occur days, weeks or even years after the first earthquake. These events can be of equal or larger magnitude to the initial earthquake, and they can continue to affect already damaged locations.

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When quakes and aftershocks occurred

 All times are Pacific time. The New York Times

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Sources: United States Geological Survey (epicenter, aftershocks, shake intensity); LandScan via Oak Ridge National Laboratory (population density) | Notes: Shaking categories are based on the Modified Mercalli Intensity scale. When aftershock data is available, the corresponding maps and charts include earthquakes within 100 miles and seven days of the initial quake. All times above are Pacific time. Shake data is as of Thursday, June 4 at 5:25 p.m. Eastern. Aftershocks data is as of Thursday, June 4 at 8:23 p.m. Eastern.