The oceans are thought to have absorbed about half of the extra CO2 put into the atmosphere in the industrial age
This has lowered its pH by 0.1 pH is the measure of acidity and alkalinity The vast majority of liquids lie between pH 0 (very acidic) and pH 14 (very alkaline); 7 is neutral Seawater is mildly alkaline with a "natural" pH of about 8.2 The IPCC forecasts that ocean pH will fall by "between 0.14 and 0.35 units over the 21st Century, adding to the present decrease of 0.1 units since pre-industrial times"
Natural lab shows sea's acid path
The world's marine ecosystems risk being severely damaged by ocean acidification unless there are dramatic cuts in CO2 emissions, warn scientists.
More than 150 top marine researchers have voiced their concerns through the "Monaco Declaration", which warns that changes in acidity are accelerating.
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