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'Living Seawalls' Bring back Biodiversity to Sydney Harbor

Harbor waterfront seating is devoid of people at sunset in front of the Sydney Harbor Bridge during a lockdown. (Reuters)
Harbor waterfront seating is devoid of people at sunset in front of the Sydney Harbor Bridge during a lockdown. (Reuters)
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'Living Seawalls' Bring back Biodiversity to Sydney Harbor

Harbor waterfront seating is devoid of people at sunset in front of the Sydney Harbor Bridge during a lockdown. (Reuters)
Harbor waterfront seating is devoid of people at sunset in front of the Sydney Harbor Bridge during a lockdown. (Reuters)

In sight of Sydney's iconic Harbor Bridge, marine scientist Mariana Mayer Pinto gingerly steps into the dark waters to examine a seawall covered with hexagonal concrete panels marked with divots that are thronged with kelp, seaweed and barnacles.

About 50% of the natural shore of the harbor has been transformed by seawalls and pilings, which do not support biodiversity the same way a natural coastline would.

Sydney's Institute of Marine Science (SIMS) with the help of scientists from the University of New South Wales (UNSW) and Macquarie University have crafted a solution using three-dimensional concrete panels in what they call the "Living Seawalls" project.

Specifically designed panels can be retrofitted onto existing seawalls, simulating the natural shoreline ecosystem that provides habitats for organisms such fish, algae and invertebrates that flat seawalls cannot.

"We have seen a total of more than 90 species colonizing these diverse panels and we see 30 to 40 percent more species on the panels in the living seawalls then on the unmodified parts of the seawall," said project co-leader Mayer Pinto, a professor at UNSW.

In just several months, the panels are colonized by marine life, and since many of the organisms are filter feeders like oysters and barnacles, the water quality of the harbor improves, Mayer Pinto said.

Popular in Australia, the panels have also been installed in Wales and Singapore.

The project has also been selected as one of 15 finalists for the Earthshot Prize by the Royal Foundation of the Duke and Duchess of Cambridge.

Mayer Pinto said that she hopes coastal structures built in the future would be ecologically sustainable, designed not only for humans, but also for nature.

"I grew up on the ocean, the ocean's my happy place so I really want my kids to be able to enjoy the ocean as I did growing up and for that we really need to take a bit more care of it."

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Separated by LA Wildfires, a Happy Reunion for Some Pets, Owners

Serena Null is reunited with her cat Domino, who was burned in the Eaton Fire, at Pasadena Humane, an animal shelter in Pasadena, California, on January 17, 2025. (AFP)
Serena Null is reunited with her cat Domino, who was burned in the Eaton Fire, at Pasadena Humane, an animal shelter in Pasadena, California, on January 17, 2025. (AFP)
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Separated by LA Wildfires, a Happy Reunion for Some Pets, Owners

Serena Null is reunited with her cat Domino, who was burned in the Eaton Fire, at Pasadena Humane, an animal shelter in Pasadena, California, on January 17, 2025. (AFP)
Serena Null is reunited with her cat Domino, who was burned in the Eaton Fire, at Pasadena Humane, an animal shelter in Pasadena, California, on January 17, 2025. (AFP)

When Serena Null saw the flames roaring toward her family home in the Los Angeles suburb of Altadena, she ran to find her pet Domino, but the cat eluded her grasp.

"We could see the fire from the front door, and so we just didn't have enough time, and we had to leave him," the 27-year-old Null said.

The ferocious blaze reduced her mother-in-law's house to ashes, and a search of the blackened rubble the following day proved fruitless. Null feared she would never see her green-eyed friend again.

But on Friday, to her amazement, she and Domino were reunited.

"I just was so relieved and just so happy that he was here," a tearful Null told AFP outside the NGO Pasadena Humane, where Domino -- suffering singed paws, a burnt nose and a high level of stress -- had been taken after being rescued.

Domino is one of several hundred pets brought to the center as the Eaton fire roared through Altadena, forcing thousands of people to flee their homes in such a rush that many left with nothing but the clothes on their backs.

Pasadena Humane was accustomed to dealing with crises, but the sudden explosion in demand was without precedent.

"We've never had to take 350 at once in one day before," said the center's Kevin McManus. "It's been really overwhelming."

- Search and rescue -

Many animals were delivered by their owners, who had lost their homes and had to find temporary housing for pets while they themselves stayed in hotels or shelters.

But others were brought by rescue workers and volunteers. The center says on its website that when it receives a report of a pet left behind, it sends "search and rescue teams as quickly as possible in areas that are safe to enter."

The center opened up as much space as it could to accommodate the influx, even placing some pets in offices.

And it was not just dogs and cats, McManus said. There were species rarely seen in an animal shelter -- like a pony, which spent a night in the center.

More than 10 days after the fires began raging through Los Angeles, the center still houses some 400 animals, including rabbits, turtles, lizards and birds, including a huge green, red and blue macaw.

Many of the pets' owners, still without permanent housing, come to the center to visit their animal friends -- people like Winston Ekpo, who came to see his three German shepherds, Salt, Pepper and Sugar.

As firefighters in the area make progress, many animal owners are able to come and recover their pets, tears of sadness turning to tears of joy.

- Back home -

The center's website posts photos of recovered animals, including information on the time and place where they were rescued.

McManus said some 250 pets have so far been returned to their owners.

One of them, curiously, was Bombon, who had actually been lost long before the fires.

The Chihuahua mix went missing from its Altadena home in November, said 23-year-old Erick Rico.

He had begun to resign himself to never seeing Bombon again.

Then one day a friend told him he had seen a picture on the Pasadena Humane website that caught his attention.

When Rico saw it, he was so excited he couldn't sleep that night -- "it looked exactly like him," he said -- and he arrived at the center early the following morning.

When he saw his owners, Bombon "started crying a lot, wagging his tail and everything. He was very, very happy."

After the painful days of uncertainty, Rico too finally felt relief. "Now I'm just happy that he's back home."