Whenever there’s a problem in the modern world, we can usually find a technological solution for it.
We humans have grown accustomed in recent times to just expecting there to be a machine, gadget
or an app designed to help improve our lives in one way or another. But while the tech revolution
has been unfolding before us, we’ve also seen major issues emerge on planet Earth itself…
and we’re increasingly at a loss over what to do about them. With the spectre of environmental ruin
increasingly dominating headlines, the race is on to make things right. But perhaps sometimes,
rather than tech, we’d be better to turn our attention back to the natural world…
This is Unveiled, and today we’re answering the extraordinary question;
could this tiny ocean predator solve Earth’s carbon problem?
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Welcome to the ocean, as beautiful as it is mysterious. And the stats are well known by now.
Around seventy-one percent of the Earth’s surface is covered by water,
and yet around eighty percent of the ocean is still said to be “unexplored”. And while
there has been a greater push in recent years to increase our knowledge, the seas still rank
as one of the greatest unknowns on our planet. It's perhaps little wonder, then, that so many
legends and conspiracies surround what could be lurking in the deep. From the Kraken to the Loch
Ness monster, we humans have continually cooked up stories of monstrous beings that might be hiding
out of sight. All while we’ve gorged on tales of Great White sharks, killer whales and other ocean
hunters with an unabating interest. However, while not every ocean predator is quite so
“Hollywood blockbuster” in its approach, scientists believe that they may have just
discovered one that really could save the world. The single-celled microbe known as Prorocentrum
cf. balticum (or, P. cf. balticum) could become vital in our efforts to lower
carbon levels on Earth. It’s what’s known as a mixotroph, which broadly means that it can make
use of multiple sources and methods for energy generation. With P. cf. balticum specifically,
it uses photosynthesis (much like the more widely understood phytoplankton does) but it
also eats other microbes. This means that it could potentially survive in ocean regions that are more
lacking the conditions needed for photosynthesis… and is potentially, then, a stronger,
hardier, and more versatile organism than phytoplankton. But why does that matter?
For years, we’ve realized how phytoplankton has been leading the line for the carbon cycle on
Earth, capturing carbon on the ocean’s surface and ridding us of it by transporting it to deep
water. With mixotrophic organisms, however, the carbon turnover rate is essentially much
higher. P. cf. balticum has been found to ensnare other microbes in a kind of mucus-like product,
before feeding on them… and then discarding them, again to the deep water. In short, this means that
more carbon is being processed and contributed to the carbon cycle. More of what we want
less of on the surface… is sinking to the floor. The bacteria were discovered off the coast
of Australia, by a team at the University of Technology Sydney (UTS). The study was published
in “Nature Communications” in March 2022. And, while it remains early to draw major conclusions
from the find, there is a sense of excitement and optimism. According to an accompanying
article published by UTS, the newly discovered microbe could “sequester carbon naturally,
even as oceans warm and become more acidic”. The study lead, Doctor Michaela Larsson,
has explained that P. cf. balticum could “occupy parts of the ocean devoid of dissolved nutrients
and therefore unsuitable for most phytoplankton”. Meanwhile, Professor Martina Doblin, another
author on the study, has suggested that “there is perhaps greater potential for the ocean to capture
more carbon naturally through this process”. Doctor Larsson further compares the mixotrophic
organism to something like a Venus flytrap on the ground. Not only does a Venus flytrap
photosynthesise normally, but in catching insects it has another (and seemingly effective) means
of turning over carbon. A mixotroph has the potential to do so much more of the heavy lifting,
then, which is something we could really need going forwards. The team at UTS refer to a widely
cited 2018 report by the National Academies of Sciences, Engineering, and Medicine in the US,
which claims that to stabilize carbon levels we’ll need to be removing around 10 gigatons of
CO2 by the year 2050. A new breed of microscopic predator could certainly help toward that goal.
It's not as though P. cf. balticum is our only hope, however. And, as humans are prone to do,
we have turned our technological minds to the problem, too. An increasingly prominent phrase
in future tech is Direct Air Capture (or DAC). In short, this is a proposed, artificial method for
drawing CO2 out of the air. Advocates generally envision a future time when the planet is dotted
with DAC plants. These plants could well be vast and sprawling depots, that will essentially suck
in the surrounding air, filter the CO2 out of it, potentially reuse that CO2 or else
bury it, and re-release the filtered, clean air back out into the atmosphere.
The theory works but there are various potential problems. Critics claim that DAC plants could
prove far too expensive… or could even be counter-productive due to the energy required
to make them work. While estimates vary, it’s thought that we could need tens of thousands of
working DAC centers before we even begin to break even with carbon… and that’s a future that remains
difficult for investors or governments to commit to, seeing as the technology
is still within its very early stages. Supporters of DAC, however, are clear
that it could yet be our best hope. The argument being that a DAC plant removes at least some of
the responsibility from the individual. It’s a mass scale technology that requires less
in terms of everyone changing their behaviour. And as carbon emissions are reportedly still
rising despite the various warnings in recent years that society needs to change,
perhaps this kind of strongarm approach is really what’s required. On the other hand, might there
yet be a balance to be struck? And could the natural world again play a significant role?
Many hope so, and it's perhaps one reason why breakthroughs such as that made by the University
of Technology Sydney could prove so important in the long run. While the unknown prospect of
air-cleaning, DAC factories looming on the horizon of our future world can perhaps feel a little
ominous or daunting… the notion of introducing more natural carbon cleaners into the environment
seems remarkably simple. UTS’s Professor Doblin addressed the possibility for large-scale
cultivation of P. cf. balticum in the same UTS article following her study’s release, explaining
that there’s more work to be done. We need to find out more about this particular microbe… and
perhaps there are more mixotrophic organisms out there, too, waiting to be discovered.
It’s certainly another reason why exploring more of the ocean might be a good idea. At this early
stage, however, Doblin says that “this could be a game changer in the way we think about carbon
and the way it moves in the marine environment”. One thing’s for sure, when it comes to fighting
climate change any improvement is good news. The microbe discovered by UTS has already
been widely described as a “secret weapon”… but time will tell how effective it can be. For now,
it’s one potential solution in a tentatively growing arsenal of technologies and natural
remedies that might prove crucial. But the chief concern is still whether we’re moving fast enough.
Whether it’s Direct Air Capture or natural, mixotrophic microbes, our innovations
and discoveries need to be converted into real-world climate change answers, and quickly.
So, what’s your verdict? Could this microscopic organism really solve all
our problems? Should we be introducing more of it into the ocean? Or is DAC a better option?
Or maybe a combination of the two? There’s no doubt that the tech-based answers offer
plenty in terms of innovation, but perhaps the natural world could still be our most revealing
and reliable source of inspiration when it comes to getting back to where we want
to be… because that’s how this tiny ocean predator could solve Earth’s carbon problem.
What do you think? Is there anything we missed? Let us know in the comments, check out these other
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