Escaping The Heat
The warning comes from the eminent scientist who has used coral from the Great Barrier Reef to reveal disturbing changes in the chemistry of the world's oceans due to human activity.
Professor Malcolm McCulloch, a geochemist with the ARC Centre of Excellence for Coral Reef Studies and Australian National University today receives Australia's top honour for earth sciences, the Australian Academy of Science's Jaeger Medal.
"Coral can't escape the heat," he says. "Besides the effects of global warming, corals will not be able to avoid the acidification of the oceans, which is a simple and direct consequence of humanity's interference in the atmosphere. About 40 per cent of the CO2 we release dissolves into the oceans, turning them more acidic."
Analysis of corals taken from the sea off Cairns revealed an increase in acidity of as much as 0.3 pH units since the start of the industrial age, with most of it occurring in the last 50 years, he explains. If seawater acidifies only a few tenths of pH units further many corals, diatoms and shellfish will be unable to form their skeletons and shells, posing the risk of major extinctions and a threat to marine food chains.
"It's getting to the point where, besides reducing our carbon emissions humanity is probably going to have to find large-scale ways of actually removing carbon from the atmosphere..
