Newsnight film on the impact of CO2 on the Oceans.
A third of all man made emissions of CO2 dissolve into our oceans forming carbonic acid. As those emissions increase scientists predict dramtic changes to sea life.
In Papua New Guinea a unique phenomenon, whereby CO2 is naturally released into the sea through volcanic vents, is acting as nature's warning. It gives scientists a clue to what could happen to our oceans in decades to come.
Roger Harrabin reports.

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