Heinrich Heine University Düsseldorf study dated August 27, 2025 shows ocean acidification weakens shark teeth Ocean pH projected to drop from 8.1 to 7.3 by 2300 due to CO2 absorption 600 shark teeth samples tested at pH 8.1 and 7.3, revealing microscopic damage Acidic conditions may reduce shark feeding efficiency and digestion Professor Sebastian Fraune warns of higher energy costs for tooth repair in acidified waters Study urges global carbon emission cuts and further live-animal research.