How Climate Change Impacts Australia’s Great Barrier Reef

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In the wake of the Australian bushfires, the images coming
out of the country set ablaze were jarring. The collision of the country’s most
extreme drought and most extreme temperatures shocked the world. With views of
a scorched Earth and injured or perished animals flooding social media and news
outlets, it was easy to see the devastation.

“Extreme heat, in itself, is a really underestimated risk to
us,” says Dr. Sophie Lewis, an award-winning climate scientist at the
University of New South Wales Canberra. “The fires, we see how dangerous they
are, but extreme heat is Australia’s deadliest natural disaster.”

The damage to the beloved underwater ecosystem of the Great Barrier Reef is much harder to put into perspective. Record temperatures pose many direct threats to human health and the environment in Australia. It has also fueled a crisis in the ocean.

“It has impacts on our ecosystems like our GBR.  A lot of our marine wildlife is quite
vulnerable to that heat,” Dr. Lewis added.

Much like the kangaroo and koala, the majestic Great Barrier
Reef is also an Australian icon that is being threatened by climate change.

The Great Barrier Reef is the world’s largest coral reef,
making it one of the seven natural wonders of the world. The reef is home to
more than 1,500 fish species and so expansive that it’s visible from
space. 

Just as extreme heat threatens those on land, it also
jeopardizes the reef.

Professor Madeleine van Oppen is an ecological geneticist
with a passion for corals.

“The health of the Great Barrier Reef is actually not so
good. In 2016 and 2017, we had very severe heat waves, so back-to-back
heatwaves. In those two years and over the course of the two years, we lost
about half of all the coral present on the Great Barrier Reef,” van Oppen said.

The natural wonder draws more than two million tourists each
year. Ultimately, infusing $6.5 billion to the Australian economy.

The underwater ecosystem also adds a layer of protection from the fury of storms and the source of life for its people. 

Owners of a kangaroo rescue in Australia were forced to flee when fire ripped through the area. They returned not knowing what happened to the kangaroos.

“Almost the only food that some people can obtain is from
the reef to feed their families and for their economies as well. More than 30
percent of all marine species live on coral reefs, so in terms of biodiversity
values, the reefs are very important, too,” van Oppen said.

The loss of the massive reef system may also mean the loss
of scientific advancements.

Van Oppen believes some solutions could be within those
reefs, saying “we might find solutions for human disease on the reef because
there’s so much unknown and undescribed diversity” and adding that there could
be “a long list of benefits that coral reefs bring to humans.”

Climate change has already caused massive alterations for the ecosystem off the coast of Australia – and experts say it will only get worse.

“So with climate warming, we see a gradual increase in
temperature that can cause stress, but then also we see an increased frequency,
intensity and duration of these summer heat waves that are the biggest threat
to coral reefs at the moment,” adds van Oppen.

Corals are sensitive to even the slightest changes in their
environment. Therefore, as the global temperature increases, the oceans heat
up. The warmer waters cause the corals to stress and could cause a mass die-off
known as bleaching. The change in the marine invertebrates is visible as the
colorful creatures lose the algae that live inside their tissue and become
colorless.

The bleaching causes a cascade of bigger issues for the
ecosystem. After a die-off event, there is often a loss of fish and other
species that depend on the reef.

Australia’s average temperature has already warmed by 1
degree Celsius, and so have the waters of the reef. With the continued emissions
of heat trapping greenhouse gases, the temperatures around the global and
ultimately in our oceans will continue to rise as well.

In addition to warmer waters, corals are also battling, pollution
from agricultural pesticide runoff.

While bleaching is quick to occur, the bounce back of the
reef can take decades.

“It probably takes between 10 and 20 years for a reef to
recover from a severe disturbance such as one of those severe heat waves where
we lose up to 50 percent of the coral on the reef for instance.  And the problem now is that those major
disturbances occur at a much higher frequency so there’s not enough time for
the reefs to recover fully.”

Van Oppen, along with her team, is offering an asset to the
recovery efforts by working to speed up the coral evolution process with hopes
of developing methods to improve their heat tolerance.

Van Oppen says that her research gives us hope for the future of coral reefs but stresses the need for coral reef action if we want to save our reefs for future generations.

NBC 6 Meteorologist Angie Lassman breaks down the positive carbon feedback loop, a vicious cycle when the results of warming causes even more warming.

“We’ve had some very promising early results.  The challenge now is to actually implement
that in the field and also with the scale of the restoration. Those are big
challenges at the moment. Ultimately, we have to do something about climate change
– climate warming – because if we don’t address that in the long-term, the reef
will continue to decline.”

It’s not just Australia that is facing the fall of one of
their greatest habitats. This is a trend that is happening across the globe. In
fact, over the last 30 years, the world has lost half of the oceans’ corals and
Florida’s reef tract has not been spared.

 “I’m not going to
sugarcoat it. The state of the Florida Reef Tract is dire.  We are losing corals at an unprecedented rate,”
Erin Muller of the Mote Marine Lab said.

The Coral Restoration Foundation is a local organization
that is responding to the threats that our reefs face.

“I would suggest that for the first time in human history,
we’re witnessing potentially the loss of an ecosystem,” said Scott Graves, the
marine lab’s operating officer.

The parallels between Australia’s underwater troubles and
Florida’s rapid loss of corals aren’t difficult to see.

Florida’s reeling reefs have the insult of another climate change-fueled culprit to contend with, stony coral tissue loss disease.

Scientists have been ringing the alarm on climate change for decades. NBC 6’s Angie Lassman spoke to Dr. Michael Mann about what the wildfires in Australia mean to South Florida.

“What’s unusual about this disease – it’s probably the worst
coral disease outbreak that’s ever been recorded anywhere in the world,” said Andrew
Baker, Associate Professor of Marine Biology and Fisheries at the University of
Miami. “This is kinda the straw that breaks the camel’s back.”

Like Australia, the reefs off the Florida coast also offer
protection from hurricanes and pump money into our economy.

Ron Magill of Zoo Miami has a deep passion for the animals
of the world, including coral reefs.

“Reefs are the rainforests of the oceans. They’re also a
huge economic engine for us. Tourism. People come here to fish, to go diving,
to go snorkeling.  All of that can be
catastrophically wiped out by just a 1 to 2 degree rise in temperature.”

Coral reefs protect South Florida’s coastlines from storms,
as well some natural threats that some residents may have, including storm
surge.

Similar to the Great Barrier Reef, part of Florida’s identity would be lost, not only for the present but for lasting generations, without its reef tract.

“Without the reef, we don’t’ have anything in the Keys,”
says Alex Neufeld of Coral Restoration Foundation. “The reefs are everything.
They’re what the economy is based on. It’s what people’s livelihoods are based
on. It’s what people’s social lives and memories and experiences are based
on.  And without the coral, nobody’s
going to have those memories in the future.”.

Here in South Florida, the reefs bring in an estimated $4.5
billion and account for 70,000 jobs.

Like Dr. Van Oppen, researchers in Florida are trying their
own assisted evolution approach to recover the state’s reefs. 

The efforts have shown promise so far with thousands of
coral being saved and replanted. However, the continued warming of ocean waters
at unprecedented rates will likely cancel out the initiative.

“I’m hoping that what’s happening in Australia is a wakeup
call to people not just here, but around the world,” Magill said.

Experts across the globe agree that the future of our coral
reefs worldwide look dire and grim without climate action.

“Curbing climate warming is critically important to try and
save coral reefs.  If we don’t achieve
that, there’s very little hope for coral reefs,” van Oppen said.


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