evidence: Sea Level – The report’s authors find that even if the temperature increase is limited to 1.5 degrees Celsius, sea level will continue to rise, as heat already stored in the oceans from human-produced warming causes them to expand. [...] Ocean Temperatures, Acidity, Oxygen Levels — Limiting warming to 1.5 degrees Celsius would reduce increases in ocean temperature and associated increases in ocean acidity and decreases in oxygen levels, which pose significant risks to marine biodiversity, fisheries and ecosystems, the report finds. 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.