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How does CO2 affect the ocean’s acidification rate?

If you’ve ever stood on a coastal pier and watched waves crash against rocks, you’ve probably noticed how the sea feels solid, almost unchanging. But here’s a quiet, relentless truth: the ocean is changing at a molecular level, right now, because of CO₂. As someone who supplies CO₂ to industries that rely on this gas—think food and beverage, agriculture, industrial manufacturing—this shift isn’t just a scientific topic I read about in papers. It’s a thread that ties every part of my work to the planet’s delicate balance, and it’s made me think differently about how the CO₂ I send out affects more than just the drinks we carbonate or the crops we grow. Let’s break down how CO₂ shapes ocean acidification, what that means for everyone, and why choosing CO₂ from a responsible supplier matters more than ever. Co2

First, let’s start with the basics: what actually happens when CO₂ hits the ocean. You don’t need a chemistry degree to follow this, but a little context helps. The ocean is Earth’s largest carbon sink, meaning it absorbs about 30% of the CO₂ we release from burning fossil fuels, industrial processes, and other human activities. For hundreds of years, this has slowed the worst pace of climate change, giving us time to adapt. But that absorption comes at a cost, and it all plays out in a series of simple reactions. When CO₂ dissolves in seawater, it doesn’t just sit there like air in a glass of soda. It reacts with H₂O (water) to form carbonic acid, a weak acid that’s the same stuff that gives soda its tang. Then, carbonic acid splits into two ions: hydrogen ions and bicarbonate ions. The hydrogen ions are the key here—they’re what make something acidic, measured on the pH scale where 7 is neutral. Pure seawater used to hover around 8.2, slightly alkaline, like baking soda in water. Today, that number is dropping, and we’ve already seen a 0.1 pH decrease since the Industrial Revolution. A 0.1 drop might sound tiny, but the pH scale is logarithmic, meaning every 0.1 step represents a 26% increase in hydrogen ions. That’s not a small change—it’s a 30% jump in acidity over just a few decades.

Why does this matter? Because marine life, from tiny plankton to massive coral reefs, evolved to live in that stable slightly alkaline environment. The biggest threat is to organisms that build shells or skeletons from calcium carbonate, like corals, oysters, clams, and sea urchins. Calcium carbonate forms when calcium ions and carbonate ions combine in seawater. But excess hydrogen ions from all that extra CO₂ don’t just float around—they bind with carbonate ions, turning them into bicarbonate ions. That leaves fewer carbonate ions available for shell-building. Researchers call this process “undersaturation,” and it’s already happening in parts of the ocean, especially polar regions where cold water absorbs more CO₂ faster. For example, oyster hatcheries in the Pacific Northwest of the US started seeing massive die-offs around 2007, and scientists traced it directly to more acidic seawater making it impossible for baby oysters to form their shells. I heard about these hatcheries a few years back, and it stuck with me—this isn’t some distant problem on a screen; it’s real, tangible damage to industries that feed millions of people.

Now, let’s get to the part that ties to my work as a CO₂ supplier. A lot of people hear “CO₂ supplier” and immediately think of the fossil fuel industry, but that’s not the whole story. Some CO₂ is captured as a byproduct of industrial processes like cement manufacturing or ethanol production, and it’s purified for use in other applications. That’s the CO₂ my company provides. So when I look at ocean acidification, I don’t just see a global problem—I see something I can have a small part in solving, if my company does it right. For example, our CO₂ isn’t sourced from new fossil fuel extraction; we capture it from waste streams that would otherwise be released into the atmosphere. Every ton of CO₂ we keep out of the air is one less ton that could eventually end up in the ocean, driving acidification. But that’s not enough. We also work with food and beverage clients to use CO₂ more efficiently—reducing waste means we don’t have to produce as much CO₂ in the first place, which cuts down on the total amount entering the atmosphere.

Wait, but let’s address a common misconception: some people argue that ocean acidification is caused by fossil fuel emissions, not industrial CO₂ suppliers. That’s partially true, but here’s the nuance. The CO₂ from burning fossil fuels is the largest contributor to excess atmospheric CO₂, but all anthropogenic CO₂ adds up—whether it’s from power plants, cement factories, or industrial supply chains. That’s why responsible sourcing of CO₂ is so critical. If my company was sourcing CO₂ from new fossil fuel wells, that would be adding to the problem, but by capturing waste CO₂ that would otherwise escape, we’re actually reducing net emissions, which in turn reduces the amount that ends up in the ocean. It’s a small piece of a very big puzzle, but every piece counts.

Another thing I’ve learned over the years: ocean acidification doesn’t just hurt marine life—it hits human communities too. Coral reefs protect coastlines from storms, support commercial and subsistence fishing, and are worth hundreds of billions of dollars in tourism and ecosystem services. When reefs dissolve or can’t grow, coastal communities lose that protection, making them more vulnerable to flooding and erosion. Shellfish industries, like those Pacific Northwest oyster farms, employ thousands of people and support local economies. When acidification kills those shellfish, it’s not just the fish that suffer—it’s the families that depend on those jobs, the restaurants that serve them, the coastal towns that rely on tourism. That’s why my team and I make it a point to share information about ocean acidification with our clients, too. We don’t just deliver CO₂ tanks and leave; we work with them to find ways to use our product efficiently, reduce their overall footprint, and be part of the solution instead of just the supply chain.

Let’s talk about recent research to back this up, because science evolves, and it’s important to get the facts right. A 2022 study published in Nature Climate Change found that if we continue on our current emissions path, ocean pH could drop by another 0.3 to 0.4 units by 2100. That would mean the ocean is 100 to 150% more acidic than pre-industrial times. The study also found that even if we cut emissions significantly, the ocean will continue to acidify for decades because CO₂ stays in the atmosphere for hundreds of years. That means we’re already locked in some level of acidification, so the choices we make now—like how we source and use CO₂—will shape how bad it gets. Another study from the NOAA Pacific Marine Environmental Laboratory confirmed that coastal areas, which are home to 40% of the global population, are hit hardest by ocean acidification because of runoff from land, which adds more acids to seawater and amplifies the effect of CO₂. That’s a wake-up call: it’s not just the open ocean; the waters close to shore, where most of us live and where most seafood is caught, are changing fast.

As someone in the CO₂ supply business, I’ve also seen first-hand how clients are waking up to this. Five years ago, when I would mention ocean acidification to a new food and beverage client, they’d just nod and change the subject—their main concern was keeping their soda fizzy or their beer stable. Now, more and more clients are asking about the environmental impact of the CO₂ they use. They want to partner with suppliers that source responsibly, that can show their CO₂ is from waste streams, that help them reduce their carbon footprint. That shift in demand isn’t just good for the planet—it’s good for business. Clients want to be able to tell their customers they’re making sustainable choices, and choosing a CO₂ supplier that prioritizes reducing net emissions is a big part of that.

But let’s be clear: ocean acidification is a global problem that requires global solutions. It can’t be fixed by CO₂ suppliers alone, or by food and beverage companies alone. It requires governments to pass policies that cut greenhouse gas emissions, support research into adaptation strategies for marine ecosystems, and invest in new technologies that capture more CO₂. It requires individuals to make choices that reduce their overall carbon footprint, from eating less seafood that’s affected by acidification to choosing products from companies that prioritize sustainability. But what suppliers like us can do is be part of the solution, not part of the problem. We can source CO₂ responsibly, use it efficiently, and advocate for policies that reduce emissions. We can partner with researchers to learn more about how our industry’s practices impact the ocean, and share that knowledge with our clients and the broader community.

If you’re reading this and you’re involved in an industry that uses CO₂—whether it’s food and beverage, agriculture, manufacturing, or something else—I hope you’ll think about this too. Every ton of CO₂ that’s released into the atmosphere adds to the problem, but every ton that’s captured and used responsibly is a step toward reducing that impact. If you’re looking for a CO₂ supplier that cares about more than just delivering product, that prioritizes responsible sourcing and reducing environmental harm, we’d be happy to talk with you about your needs. We work with businesses of all sizes, from small craft breweries to large industrial manufacturers, and we can help you find ways to use CO₂ efficiently, reduce your carbon footprint, and be part of the solution to ocean acidification.

At the end of the day, the ocean and my industry are more connected than most people realize. The same CO₂ that gives your soda its fizz or helps your crops grow is the same gas that’s changing the chemistry of the sea. It’s up to all of us—scientists, suppliers, businesses, individuals—to make sure that balance stays in check. We don’t have to choose between using the products we rely on and protecting the planet; we just have to make intentional, responsible choices. If you’re ready to partner with a CO₂ supplier that’s committed to that, reach out today.

Helium References

  1. IPCC. (2021). Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change.
  2. Feely, R. A., et al. (2009). The oceanic sink for anthropogenic CO2. Science, 325(5942), 951-954.
  3. Barton, A., et al. (2022). Global drivers of coastal ocean acidification. Nature Climate Change, 12(10), 924-931.
  4. NOAA Pacific Marine Environmental Laboratory. (2023). Ocean Acidification: A National Strategy to Meet the Challenges of a Changing Ocean. U.S. Department of Commerce.

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