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Canadian lake ground-zero for Anthropocene epoch

July 13, 2023
in News
Canadian lake ground-zero for Anthropocene epoch
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PARIS: Scientists on Tuesday (Wednesday in Manila) designated a small body of water near Toronto, Canada as ground-zero for the Anthropocene, the proposed geological epoch defined by humanity’s massive and destabilizing impact on the planet.

Layered sediment at the bottom of Lake Crawford — laced with microplastics, fly-ash spread by burning oil and coal, and the detritus of nuclear bomb explosions — is the single best repository of evidence that a new, and challenging, chapter in Earth’s history has begun, members of the Anthropocene Working Group concluded.

Tim Patterson (L), Professor of Geology at Carleton University, leads a team of scientists as they retrieve a probe from the bottom of Crawford Lake while gathering sediment layer samples at Crawford Lake near Milton, Ontario, Canada, April 12, 2023. The view under the surface of Crawford Lake tells a different story. Scientists believe the lake's exceptionally well-preserved sediment layers serve as a reference point for a proposed new geological chapter in the planet's history, defined by the considerable changes wrought by human activity: the Anthropocene. The International Commission on Stratigraphy's Anthropocene Working Group on July 11, 2023, named the lake as the embodiment of the proposed Anthropocene epoch. Peter POWER / AFP

Tim Patterson (L), Professor of Geology at Carleton University, leads a team of scientists as they retrieve a probe from the bottom of Crawford Lake while gathering sediment layer samples at Crawford Lake near Milton, Ontario, Canada, April 12, 2023. The view under the surface of Crawford Lake tells a different story. Scientists believe the lake’s exceptionally well-preserved sediment layers serve as a reference point for a proposed new geological chapter in the planet’s history, defined by the considerable changes wrought by human activity: the Anthropocene. The International Commission on Stratigraphy’s Anthropocene Working Group on July 11, 2023, named the lake as the embodiment of the proposed Anthropocene epoch. Peter POWER / AFP

Tim Patterson (L), Professor of Geology at Carleton University, leads a team of scientists as they retrieve a probe from the bottom of Crawford Lake while gathering sediment layer samples at Crawford Lake near Milton, Ontario, Canada, April 12, 2023. The view under the surface of Crawford Lake tells a different story. Scientists believe the lake’s exceptionally well-preserved sediment layers serve as a reference point for a proposed new geological chapter in the planet’s history, defined by the considerable changes wrought by human activity: the Anthropocene. The International Commission on Stratigraphy’s Anthropocene Working Group on July 11, 2023, named the lake as the embodiment of the proposed Anthropocene epoch. Peter POWER / AFP

“The data show a clear shift from the mid-20th century, taking Earth’s system beyond the normal bounds of the Holocene,” the epoch that began 11,700 years ago as the last ice age ended, working group member Andy Cundy, a professor at the University of Southampton, told Agence France-Presse (AFP).

After years of deliberation, the Canadian lake was selected from among 12 candidate sites around the world — including another lake, coral reefs, ice cores and an ocean bay in Japan — as the Anthropocene’s so-called golden spike.

“The sediment found at the bottom of the Crawford Lake provides an exquisite record of recent environmental change over the last millennia,” said working group chairman Simon Turner, a professor at University College London. “It is this ability to precisely record and store this information as a geological archive that can be matched to historical global environmental changes.”

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Those changes are currently on dramatic display: last week was the hottest globally on record. Out-of-control forest fires have been ravaging Canada for months, while the US and China are coping with unprecedented heat, flooding and drought at the same time.

Humanity has burned so much fossil fuel that concentrations of planet-warming CO2, meanwhile, have increased by half. Sea surface temperatures have hit new highs in recent weeks, and Antarctic sea ice last month was 17 percent below the previous record low for June.

‘Great Acceleration’

Last month, scientists reported that so much water has been pumped from underground reservoirs that Earth’s geographic North Pole has shifted by nearly 5 centimeters (2 inches) per year.

According to the rules of the International Commission on Stratigraphy (ICU), which in 2009 mandated a team of geologists to assess evidence for the Anthropocene, there must be a synchronous “primary marker” for a proposed boundary that is detectable in the geological record almost anywhere on the planet.

For the Anthropocene, plutonium cast off by hydrogen bomb tests provides that “global fingerprint,” explained Cundy.

“The clearest marker for a single year — which gives an abrupt and effectively instantaneous snapshot — is plutonium, because there’s so little of it naturally present.” That means 1952 — when the United States first detonated a huge hydrogen bomb in the Marshall Islands as a test — could become the Anthropocene’s boundary year, he said. Smaller atom bomb explosions before that left mostly regional imprints.

A sharp, hockey-stick increase across a dozen markers of humanity’s growing impact — including population, water use, greenhouse gas emissions, and forest loss — bunched around the middle of the 20th century add up to what scientists call the Great Acceleration.

The “epoch of humans” first proposed in 2002 by chemistry Nobel Paul Crutzen is widely accepted within science as a reality, but faces daunting hurdles for formal validation by the gatekeepers of Earth’s official geological timeline of eons, eras, periods and epochs, such as the Jurassic and the Cretaceous.

Scientists at the press conference to announce Crawford Lake said they hoped the decision would encourage people to think more deeply about their responsibility to the planet.

Francine McCarthy, a professor at Brock University who has led the research into Crawford Lake, said it was not the first time humans had stamped their influence on the lake.

“But at no point was there a globally synchronous shift in the way the earth behaved until this Great Acceleration of the mid 20th century,” she said, adding it marked a tipping point when the “Earth system ceased to behave the way it had for 11,700 years.”

The recommendations must be approved by a super-majority vote of two separate committees before final validation by the International Union of Geological Sciences (IUGS).

The heads of those bodies have thus far expressed sharp skepticism toward the Anthropocene, mostly on technical grounds.

“The vote in the working group is on a routine step at the lowest level,” IUGS General-Secretary Stanley Finney told AFP.

The working group has yet to submit its final recommendation to the International Commission on Stratigraphy, he noted.

“Only then can it be given peer review, and the evidence and arguments truly evaluated,” Finney said.

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Copyright for syndicated content belongs to the linked Source : The Manila Times – https://www.manilatimes.net/2023/07/13/news/national/canadian-lake-ground-zero-for-anthropocene-epoch/1900372

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