海洋酸化
Ocean acidification has been compared to anthropogenic climate change and called the "evil twin of global warming" and "the other problem". Freshwater bodies also appear to be acidifying, although this is a more complex and less obvious phenomenon. To ensure that ocean acidification is minimized, the United Nation's Sustainable Development Goal 14 ("Life below Water") aims to ensure that oceans are conserved and sustainably used. As members of the InterAcademy Panel, 105 science academies have issued a statement on ocean acidification recommending that by 2050, global emissions be reduced by at least 50% compared to the 1990 level.