The ocean is about to take center stage at the United Nations’ annual climate change conference in Bonn, Germany. November 11 is officially Oceans Action Day at COP23, when leaders of government, businesses and organizations around the world turn their attention to the sea that covers more than 70% of our planet.
Speakers at the international gathering will discuss how carbon emissions from human activities are changing the world’s ocean (and not for the good)—including impacts on marine wildlife, fisheries and aquaculture, and coastal communities. They’ll also explore science-based solutions, such as ramped-up development of renewable energy and ecosystem-based adaptation to the changes already underway.
Ocean Action Day includes a program at the U.S. Climate Action Center—the largest pavilion at the climate talks. Michael Bloomberg (the former mayor of New York City and a U.N. Special Envoy for Cities and Climate Change) and California Gov. Jerry Brown will release a new “America’s Pledge” report detailing what U.S. states, cities, and businesses are doing to keep the U.S. on track to meet its Paris Agreement carbon reduction goals. They will be joined by Pittsburgh Mayor Bill Peduto and Laura Phillips, Senior VP of Sustainability for Walmart, to discuss specific actions to meet the emission targets established under the Paris Agreement.
The day will conclude with a signing ceremony for the “Because the Ocean Declaration,” an effort led by Chile, urging nations of the world to protect the ocean as they map paths toward implementing the breakthrough Paris Agreement—the commitment, adopted two years ago by nearly every nation in the world, to reduce our emissions of heat-trapping gases. The island nation of Fiji is also leading a collaborative effort, called the Ocean Pathway Partnership, to give the ocean the prominent place it deserves in the U.N.’s ongoing climate conversations.
Life seems easy for the little red tuna crabs delighting Monterey Bay Aquarium visitors. The temperature and water chemistry in their exhibit are carefully controlled and stable. In the wild, it’s a different story. Conditions are changing—fast. Crabs and other critters are in a race with time, as record levels of atmospheric carbon dioxide (CO2) warm the planet and change ocean chemistry.
For more than a century, scientists have known that burning fossil fuels warms our planet. They’ve also long been aware of another impact—this one affecting ocean chemistry.
In 1909, a chemist at the Carlsberg Brewery Laboratory discovered that CO2 dissolved in water not only creates tiny bubbles (like in beer). It also makes liquid more acidic. In other words, our burning of fossil fuels is changing the chemistry of the ocean, a process called ocean acidification.
The impact of rising atmospheric CO2 developed slowly and subtly. By the 1960s, however, climatologists began raising alarms. Decades later, Al Gore’s landmark book and movie, An Inconvenient Truth, framed climate change as an urgent threat to human survival. As the scientific community worked to build accurate models of climate dynamics and explore ways to deal with rampant carbon, some eyed the ocean—which absorbs 25 percent to 30 percent of the excess CO2 in the atmosphere—as a solution. Could we stash even more atmospheric carbon in the sea, sparing the planet the worst impacts of global warming? Continue reading Science on the front lines of ocean acidification