evidence: People in river basins, especially in the Middle and Near East, will be particularly vulnerable. [...] The oceans will become more acidic due to higher concentrations of carbon dioxide at 1.5 degrees warming that will become even higher at 2 degrees warming, negatively impacting a broad range of species, from algae to fish. Ocean oxygen levels will also decrease, leading to more "dead zones," areas where normal ocean waters are replaced by waters with low oxygen levels that won’t support most aquatic life. [...] For more on the IPCC Special Report, visit http://www.ipcc.ch/sr15/.