A study published last month uncovered a disturbing change to life on Earth. And it's not predicted to happen sometime in the future -- it's already happened…
By David Sussin
If humanity is going to be destroyed by climate change, it's likely millions of years from happening. But the steps along the way are no fun either.
There are climate trends happening now we should beware of, not because we can't survive them, but because there are dangerous creatures that may begin to thrive.
A study published last month (June 6, 2025) uncovered just such a disturbing change. And it's not predicted to happen sometime in the future -- it's already happened…
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The study was titled, "Ocean Acidification: Another Planetary Boundary Crossed." The name was simple, but the research behind it was complex and comprehensive.
It was conducted by teams of scientists from a range of environment-focused institutions (the Plymouth Marine Laboratory in the UK, the Pacific Marine Environmental Laboratory in Washington, the National Centers for Environmental Information in Maryland, Cooperative Institute for Marine Ecosystem and Resources Studies at Oregon State University, among many others).
The goal was to test ocean acidification. Oddly enough, to do this, scientists don't study acidity directly. Turns out, those numbers vary quite a bit, and any single reading may not tell you much about the long-term state of the oceans.
Instead, the study focused on the saturation levels of aragonite, a form of calcium carbonate used by marine organisms to build shells and skeletons.
When aragonite levels are low, or undersaturated, organisms can't produce shells or bones or coral. If this becomes the normal state of the oceans, it's a major tipping point. Entire ecosystems will die off.
Unfortunately that's exactly what they discovered.
The results showed the average global surface ocean conditions entered the uncertainty range of the ocean acidification boundary back in 2020. Suitable habitats for marine life that need aragonite to live had reduced by 43% in tropical areas, up to 61% in polar climates, and 13% for coastal species.
Four of seven ocean basins globally have become dangerously acidic: the Arctic, the North Pacific, the Southern Ocean, and the North Atlantic. Numbers were even more dire in the subsurface ocean (below 200 meters), where aragonite levels decreased by 18% globally.
Simply put, the world's ocean acidity balance is no longer stable. It's trending dangerously high, to a point where marine ecosystems may change in dangerous ways.
The first to die off? Warm water coral reefs, coastal oysters and muscles, and polar pteropods (kind of like floating snails crucial to the food chain in the Arctic and Antarctic).
These are fundamental building blocks of marine life, crucial to the ocean's food chain. Their loss would cascade through every level of marine life, leading to widespread ecosystem collapse.
Except for those predators who don't mind acidity so much. For example, if they have no shells or skeletons at all. If it's all soft tissue and muscle, somehow combined by nature to form an intelligent animal. Where coral and clams and fish collapse in acidic waters, these creatures might dominate, even thrive.
We may be entering the dawn of the squid.
The kind of cephalopods we call "squids" are not the creatures you'd choose to suddenly dominate a large part of our world -- they're odd, and alien, and somewhat poisonous. Add to that, they are among the smartest creatures on the planet.
They have proven the ability to learn and remember and problem-solve. We only recently realized they were communicating with each other through skin color changes. And they've even shown signs of tool use.
Then there's the alien-like aspects -- like the giant squid's thirty-foot long nervous system, giving it lightning fast and complex sensory processing beyond even human beings, and its eyes as large as ten inches across, the size of a dinner plate.
Giant squid can detect prey even in pitch black ocean conditions. If that isn't alien-like enough, their blood uses a copper-based molecule called hemocyanin to transport oxygen, turning it blue.
Scariest of all squids is the Humboldt, known as the red devil. They are highly aggressive and hunt in packs, even attacking divers and boats. The beak of the Humboldt can literally crack your bone. And its suction cups are, disturbingly, lined with teeth.
Unchecked by other predators in a newly unbalanced acidic ecosystem, these creatures of nightmares would thrive. Already known for their coordinated hunting prowess, without fear of other predators they might evolve to be more aggressive, even growing bold enough to attack activity on the surface.
Hive-minded swarms of squid, driven by a lack of food in the ocean, might infest the coastlines and shores and harbors, pushing inland in search of something to eat.
In a world where ocean acidity destroyed marine life, the three billion people on Earth who rely on seafood as their primary source of protein would face famine. And the oceans would be left to these alien-like cephalopods with no backbones.
The oceans would turn pink and blue from the masses of squid hunting for their next meal. And for this strange stage in Earth's story, the 71% of the world that is ocean would be off limits to all of us still surviving on the land.
For climate change to truly destroy all human life on Earth, it would take millions of years -- if that's the direction we continue to take. But for ecosystems to shift enough for extreme predators to flourish? According to scientists, it's happening now.
Sources:
https://www.science.org/doi/10.1126/sciadv.adh2458
https://onlinelibrary.wiley.com/doi/10.1111/gcb.70238