Laboratory experiments can tell us about how individual marine organisms react, but the geological record is a real time experiment involving the entire ocean.
Current rates of ocean acidification are unparalleled in Earth's history, according to new research from an international team of scientists which compiled all the evidence of global warming and acidifying oceans from the past 300 million years. The study, based on an expert workshop led by Columbia University's Lamont-Doherty Earth Observatory and the University of Bristol, assessed in detail a number of climate change events in the planet's history, including the asteroid impact that made the dinosaurs go extinct and the Permian mass-extinction which wiped out around 95 per cent of all life on Earth. Oceans are currently absorbing about a quarter of the CO2 released into the atmosphere, lowering the pH of the surface ocean. As atmospheric CO2 increases, so does the rate at which it will dissolve in seawater, forcing surface ocean pH lower and lower - a process called ocean acidification. Laboratory experiments suggest that if the pH continues to fall, we may start to see impacts on marine organisms such as slower growth, fewer offspring, muscle wastage, dwarfism, reduced activity and the dissolution of their carbonate shells - with knock-on effects throughout the marine ecosystem. However, as a large number of processes are involved, it is hard to predict what ecosystems in the oceans will look like in future and to what extent humans will be able to continue to benefit from the resources oceans provide. In order to learn about the future, the researchers looked to the past, reviewing climate events over the past 300 million years that showed evidence of elevated atmospheric CO2, global warming and ocean acidification.
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