An official website of the United States government.

Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Ocean and Coastal Acidification

Changing Ocean Chemistry

The carbon dioxide that humans release to the atmosphere by burning fossil fuels is changing the chemistry of the ocean by increasing its acidity. This phenomenon, called ocean acidification, is already affecting us and our environment. In addition, land-based sources of pollution can contribute to localized acidification of coastal waters.