BBC: Scientists have warned that marine life will be irreversibly changed unless CO2 emissions are drastically cut.
Writing in Science, experts say the oceans are heating, losing oxygen and becoming more acidic because of CO2.
They warn that the 2C maximum temperature rise for climate change agreed by governments will not prevent dramatic impacts on ocean systems.
And they say the range of options is dwindling as the cost of those options is skyrocketing.
Twenty-two world-leading marine scientists...