BBC: The UK's chief scientist says the oceans face a serious and growing risk from man-made carbon emissions.
The oceans absorb about a third of the CO2 that's being produced by industrial society, and this is changing the chemistry of seawater.
Sir Mark Walport warns that the acidity of the oceans has increased by about 25% since the industrial revolution, mainly thanks to manmade emissions.
CO2 reacts with the sea water to form carbonic acid.
He told BBC News: "If we carry on emitting CO2...