Ocean Acidification: The "Hidden Side" of Climate Change

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Sponsor: The Rainforest Site

As oceans absorb carbon dioxide, the gas alters the water's basic chemistry, increasing acidity and threatening marine life.


Over the past 250 years, humans have pumped increasing amounts of carbon dioxide (CO2) into the atmosphere. While science and industry scramble to understand the full impact, oceans continue to absorb as much as a quarter — approximately 530 billion tons — of this excess gas.

Extra CO2 increases acidity, reducing the amount of calcium carbonate in the water. Shell fish and coral reef, which rely on this mineral to build their shells and skeletons, are especially vulnerable to this process. Many larger fish rely on tiny marine snails and coral for food and shelter, so the effects of ocean acidification reverberate up the food chain, further depleting already struggling fish stocks.

As part of a multi-faceted solution, petition the Director of the US Fish and Wildlife Service to designate additional Marine Protected Areas — "national parks for the sea" — providing marine life with a refuge and a fighting chance against this emerging threat.

Learn more about the "state of emergency" at PMMC.

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The Petition:

Dear Director Ashe:

While governments and international organizations debate the political intricacies of carbon emissions, Earth's oceans continue to absorb massive quantities of carbon dioxide, resulting in increasingly acidic waters. This process, known as ocean acidification, threatens marine ecosystems throughout the world.

As a global problem, ocean acidification demands a global solution. Your organization, however, enjoys a unique position to grant immediate respite to marine life through the designation of additional Marine Protected Areas (MPAs). A number of statutes—including the Endangered Species Act (1973), the Fish and Wildlife Coordination Act (1934) and the Wilderness Act (1964)—endow the U.S. Fish and Wildlife Service with the authority and flexibility to create new federal MPAs. In these protected zones, marine ecosystems have proven more resilient against global threats, such as warming seas and ocean acidification.

MPAs are not a panacea for ocean acidification, but as part of a coordinated response including local organizations and the international community, they do offer a short-term plan to reverse current trends. In the past, MPAs have also demonstrated unanticipated practical benefits, such as fish spillover and larval drift, helping to replenish fish stocks well beyond the area's designated boundaries. Additionally, these zones could help raise public awareness around the issue of acidification—the "hidden side" of the world's carbon crisis.

Given the imminence of ocean acidification, we cannot afford to wait for international consensus on carbon emissions. Additional MPAs offer an immediate and practical first step, and I hope your agency will exercise its legal authority to protect Earth's oceans and all who depend on them.

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Signatures: