"The ocean's chemistry is changing in lockstep with climate change. That's because the ocean is a global sponge. It absorbs about a third of the extra carbon dioxide we put into the atmosphere from burning fossil fuels, as well as most of the extra heat that carbon has trapped against the body of the planet" (41).
"Across the ocean, pH has dropped from 8.20 to 8.05 since we began burning fossil fuels at the start of the Industrial Revolution. Because pH is measured on an exponential scale, that means it's 30 per cent more acidic now than it was just 250 years ago. The ocean has not been this acidic in 65 million years" (43).
Mitchell, Alanna. "'There's No Coming Back from This.'" Canadian Geographic, vol. 139, no. 6, Nov./Dec. 2019, pp. 38-48.
"The increasing concentrations of carbon dioxide in the atmosphere react with seawater causing oceans to become more acidic. . . . Ocean acidity has increased in all of Canada's oceans. . . . Increasing ocean acidification has also been observed in the North Pacific over the last 25 years and is of concern for species in coastal fjords that are sensitive to these changes. Shellfish farmers in the Salish Sea report harmful effects from ocean acidification, especially on the larval stages of shellfish species" (14).
Canada's Oceans Now 2020. Department of Fisheries and Oceans, 2020.