NOAA's Ocean Acidification Program prepares us for the impacts of ocean acidification through research and interdisciplinary partnerships.

In 2025, scientists warned the ‘planetary boundary’ for ocean acidification had been crossed. This is what that means and why it matters

This project provides tools communities and decision makers in Southeast Alaska can use for assessing vulnerability and resilience to ocean acidification and inform adaptive strategies.

Earth has breached a critical boundary for ocean acidification, with potentially grim effects for ocean ecosystems and human livelihoods

In 2025, scientists warned the ‘planetary boundary’ for ocean acidification had been crossed. This is what that means and why it matters

Ocean Acidification added to list of Planetary Boundaries now considered to be breached, bringing the running total to seven out of nine.

Scientists warn that ocean acidification has crossed a critical planetary boundary.

Ocean acidification has already crossed a crucial threshold for planetary health, scientists say in unexpected finding

When most people hear the phrase "ocean acidification," they think of coral reefs, shellfish or declining fisheries. Those concerns are real. But while working on our recent research, I found myself a...

Ocean acidification has now surpassed the “safe operating space” for our planet’s marine systems, according to a recent study published in Global Change

Sharks could struggle to feed themselves efficiently in future, affecting marine ecosystem stability, researchers say

Ocean acidification has already crossed a crucial threshold for planetary health, scientists say in unexpected finding * More on this story: The scientists warning the world about ocean acidification – ‘evil twin’ of the climate crisis The world’s oceans are in worse health than realised, scientists have said today, as they warn that a key measurement shows we are “running out of time” to protect marine ecosystems. Ocean acidification, often called the “evil twin” of the climate crisis, is caused when carbon dioxide is rapidly absorbed by the ocean, where it reacts with water molecules leading to a fall in the pH level of the seawater. It damages coral reefs and other ocean habitats and, in extreme cases, can dissolve the shells of marine creatures. Continue reading...

The concurrent intensification of hypoxia and acidification poses a growing threat to estuarine-coastal ecosystems globally, yet their interactive impacts on nitrification, a key process in the nitrog...

Study finds that ocean acidification has significantly compromised 40% of the global surface ocean, and 60% of the subsurface ocean.

Ocean health is moving into a danger zone, with rampant human-caused carbon dioxide emissions having already pushed ocean acidification levels beyond safe limits in large swaths of the marine environm...

Ocean acidification is reshaping temperate shallow marine benthic communities and the way they function. Using community transplants at natural CO2 vents, we show that biodiversity loss under…

In this study, employing a detailed analysis of ocean carbonate system observations, models and biological assessments, we demonstrate that by year 2020, the average global ocean conditions had alrea....