'Irreversible change' to sea life from CO2

A major report warns that life in the seas will be irreversibly changed unless CO2 emissions from industrial society are drastically cut.

Twenty-two experts in the journal Science say the oceans are heating, losing oxygen and becoming more acidic - all in response to our carbon dioxide.

The scientists in Germany have been studying an event 55 million years ago that could throw light on today's challenges.

Roger Harrabin reports.