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bus333 2023. 3. 19. 09:49

SEAWEED IS HAVING ITS MOMENT IN THE SUN

March 15, 2023

 

The New York Times - 2023.03.16

 

 

 

 

For centuries, it’s been treasured in kitchens in Asia and neglected almost everywhere else: Those glistening ribbons of seaweed that bend and bloom in cold ocean waves.

 

Today, seaweed is suddenly a hot global commodity. It’s attracting new money and new purpose in all kinds of new places because of its potential to help tame some of the hazards of the modern age, not least climate change.

 

In London, a start-up is making a plastic substitute out of seaweed. In Australia and Hawaii, others are racing to grow seaweed that, when fed to livestock, can cut methane from cow burps. Researchers are studying just how much carbon dioxide can be sequestered by seaweed farms, as investors eye them as a new source of carbon credits for polluters to offset their greenhouse gas emissions.

 

And in South Korea, one of the most established seaweed growing countries in the world, farmers are struggling to keep up with growing export demand.

 

 

What was mainly a relatively small Asian industry is now coveted by the West.

 

 

 

Far beyond South Korea, new farms have cropped up in Maine, the Faroe Islands, Australia, even the North Sea.

 

 

Globally, seaweed production has grown by nearly 75 percent in the past decade.

 

The focus is moving far beyond its traditional use in cuisine.

 

But even as its champions see it as a miracle crop for a hotter planet, others worry that the zeal to farm the ocean could replicate some of the same damages of farming on land. Much is unknown about how seaweed farms, particularly those far offshore, can affect marine ecosystems.

 

“Seaweed protagonists believe seaweed is a cure to everything, that seaweed is a magical panacea for climate problems,” said David Koweek, chief scientist for Ocean Visions, a consortium of research organizations studying ocean-based interventions for the climate crisis. “Seaweed antagonists think seaweed is completely overhyped.”

 

There’s another problem. Seaweed is itself feeling the impact of climate change, particularly in Asia.

 

“The water is way too hot,” said Sung-kil Shin, a third-generation seaweed farmer, as he pulled his boat into harbor one morning on Soando Island, just south of the South Korean mainland, where seaweed has long been foraged and farmed.

 

 

 

‘PLASTIC’ FROM SEAWEED

 

Pierre Paslier once made a living by designing plastic packages for cosmetics. It felt to him like “leasing out my brain to a big plastic polluter.”

 

He wanted out. He wanted to create packaging that would come from nature and disappear into nature, quickly. With a friend from graduate school, Rodrigo García González, he created a company called NotPla, short for “not plastic.”

 

A biodegradable “plastic” membrane at NotPla’s operation in Hackney, London. Ellie Smith for The New York Times

 

A biodegradable <plastic> membrane at NotPla's operation in Hackney, London.

 

From an East London warehouse, they designed an edible sachet of water, made of seaweed and other plant extracts: To drink the water you simply pop the sachet in your mouth. They designed another one that can hold ketchup and a third for cosmetics.

 

They also began making a seaweed-based coating for takeout cardboard boxes. Just Eat, a food delivery app in Britain, began using it for some of its orders, including at the European women’s soccer finals in July at Wembley Stadium.

 

Edible bubbles designed to replace single-use packs for liquids. Ellie Smith for The New York Times

 

Edible bubbles designed to replace single-use packs for liquids.

 

It’s still niche. The seaweed coating, designed for home composting bins, is considerably more expensive than the plastic coating now used on most takeout boxes made of paper.

 

But Mr. Paslier is looking to the future. The European Union has a new law restricting single-use plastic. A global plastics treaty is under negotiation.

 

“Seaweed is not going to replace all plastic, but seaweed combined with other things can tackle single use plastic,” he said. “We are barely scratching the surface.”

 

 

 

FORAGERS FROM THE PAST

 

In the gray light of dawn, Soon-ok Goh, a slight 71-year-old, swam soundlessly in the shallow waters of Gijang, on the southern coast of South Korea. Her feet were sheathed in yellow flippers, her thin, small frame in a wetsuit. She surfaced above water for a few seconds, took a long breath that sounded almost like a whistle in the quiet of the morning, then dived down again, yellow flippers upturned.

 

Ms. Goh is among the last practitioners of a vanishing trade. Since the end of the 7th century, women like her have foraged for wild seaweed, along with other seafood, in the chilly waters around the Korean Peninsula.

 

This morning, a tiny pink-handled knife in hand, she snipped shiny green-brown ribbons of kelp called miyeok. She plucked sea snails clinging to rocks, two kinds of sea cucumbers, a handful of kelp-devouring sea urchins.

 

All went into her sack.

 

Her grandmother taught her the trade, Ms. Goh said, which is known as haenyeo, or the “sea women.”

 

She has been diving since she was 9 years old.

 

“People who do this kind of work are disappearing,” she said. “When I’m done, no one will do it.”

 

With demand rising, old practices are getting pushed into the past.

 

What role seaweed plays in your life depends on where you’re from.

 

For Alaska’s Indigenous people, seaweed has been a source of sustenance for generations. The Irish and Welsh have used it to make pudding. Japanese soup stock is made of kelp. Seaweed extracts also help millions of people worldwide keep their teeth clean; it’s been used to make toothpaste for years.

 

In Korea, bordered by water on three sides, 20 different species of seaweed have been recorded. It is central to cuisine and culture.

 

In a Seoul restaurant, many varieties on the menu.

 

 

After childbirth, mothers are served a soup made of miyeok, iron-rich and brown, and children are served it on their birthdays to honor mothers. Dried, salted sheets of gim are eaten as snacks or dusted over cookies. Wispy tendrils of maesaengi are tucked into a steamy breakfast porridge that’s believed to be a hangover cure.

 

In decades past, when there was no money to buy rice, you could go to the sea and find seaweed, said Hye Kyung Jeong, a food historian at Hoseo University in Seoul. “Seaweed helped people survive during famines,” she said.

 

This is not the first time seaweed has helped avert a crisis.

 

 

SLIMY ARMS RACE

 

The new frontier for seaweed production lies beyond Asia.

 

Steve Meller, an Australian-American businessman in Australia, grows seaweed in giant glass tanks on land. Specifically, a red seaweed native to the waters around Australia called asparagopsis, which beef and dairy companies are eyeing as a way to meet their climate goals.

 

A sprinkle of asparagopsis in cattle feed can cut methane from their burps by between 82 and 98 percent, according to several independent studies.

 

“The race is on, I suppose, to get the world’s first commercial supply,” Mr. Meller said. “The demand is off-the-roof scale.”

 

His company, named CH4 Global, after methane’s chemical formula, is competing to bring asparagopsis to the mouths of cows.

 

A manager examined the crop recently.

 

Cattle burps are a major source of methane, a potent greenhouse gas.

 

A farmer at an Australian feedlot with a handful of seaweed supplement

 

At least two other Australian start-ups, Sea Forest and Rumin8, are in the seaweed-for-cattle race.

 

So are Symbrosia and Blue Ocean Barns, both in Hawaii.

 

Fonterra, a New Zealand dairy producer, has begun commercial trials of the seaweed supplement, and Ben and Jerry’s is planning its own trials soon. The global dairy giant Danone has invested in an asparagopsis start-up.

 

Whether seaweed can make a dent in cattle methane remains unclear. In the United States, there’s another hurdle to overcome: regulatory approval.

 

Nevertheless, it could be key to the beef and dairy industry's ability to meet climate goals. Emissions from food systems alone, mainly meat and dairy, could raise the global average temperature by 1 degree Celsius by the end of the century, blowing past the threshold of relatively safe global warming, researchers have said.

 

 

CLIMATE PRESSURES

 

Seabirds dive and squawk around the fishing port in Soando, an island off the southern tip of South Korea, as Mr. Shin’s boat pulls in with the morning’s harvest.

 

Mr. Shin, 44, has plied these waters for 20 years and has seen climate change upend his trade. He grows a red kelp species called pyropia, which favors cold water during its growing season. So he has been going further and further from shore in search of chilly waves.

 

Mr. Shin&rsquo;s crew harvesting seaweed recently

 

 

 

By mid-April, Mr. Shin says, the water isn’t as cold as Pyropia likes. His yield has suffered. “People want more seaweed these days,” he said. “But there’s no more seaweed.”

 

Since 1968, the waters where Mr. Shin farms have warmed by 1.4 degrees Celsius, slightly higher than the global average. That’s why South Korean scientists are racing to breed strains that can thrive in warmer waters.

 

Seaweed farms are a far cry from the rows of corn and wheat that make up monoculture farming on land. But even as they signify new opportunities, they present ecological risks, many of them unknown.

 

They could block sunlight to creatures who need it below. They could scatter plastic buoys in the sea, which already suffers from too much plastic. They could leave their plant detritus on the seafloor, altering the marine ecosystem.

 

“It needs to be carried out with a great deal of care,” said Scott Spillias, a doctoral student in economics who studies marine systems at the University of Queensland. “We shouldn’t expect seaweed to save us.”

 

 

 

 

NASA 2021.02.19

 

NASA 2021.02.19

 

NASA의 얘기를 짧게 요약해보면

 

1) 최근 전세계적으로 해조류에 대한 수요가 급증하고 있는데 한국에서는 170만톤의 해조류를 양식하고 있음

2) 완도는 적당한 온도, 조류와 얕은 수심으로 해조류 양식의 적지임

3) 한국에서는 산모는 한달동안 미역국을 먹고 생일을 맞이한 사람이 미역국을 먹는 문화가 있음

4) 한국은 초밥에 사용되는 김의 최대 수출국임

5) 인류가 소비하는 해조류의 90%는 양식으로 길러짐

6) 해조류 양식에는 담수와 비료가 필요하지 않기고, 게다가 대기중 탄소를 흡수하기에 매우 친환경적임

 

 

부산 F1963에 입지한 현대모터스튜디오에서는 Algae를 테마로 전시중

 

 

부산 F1963에 입지한 현대모터스튜디오에서는 Algae를 테마로 전시중 - 녹조류에서 뽑아낸 플라스틱

 

 

 

기사 원문 링크 (눌러보시면, 종이 신문의 상징이였던 뉴욕타임즈가 어떻게 인터넷 시대 가장 각광받는 뉴스 매체로 변신했는지 알 수 있음)

https://www.nytimes.com/interactive/2023/03/15/climate/seaweed-plastic-climate-change.html

 

Seaweed Is Having Its Moment in the Sun

Seaweed is being reimagined as a plastic substitute, even as cattle feed. But can it thrive in a warming world?

www.nytimes.com

 

 

 

 

일본의 벤쳐캐피탈(VC) Norinchukin이 투자하는 Algal Bio 얘기가 포함된 포스팅
https://geowiki.tistory.com/3035

 

일본의 식량 자급 자족 가능할까?

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