CO2 emissions will cause the damage to marine life beyond repair if no actions are being taken now, warned scientists. Researchers have to say that CO2 emissions are increasing the temperature of oceans. Oxygen level of the oceans is going down and they are becoming more acidic.

Scientists said that the 2C maximum temperature rise for climate change agreed by governments is even not enough to prevent ocean systems from damaging effects of CO2 emissions.

The researchers said the range of options is on decline and the cost of those options is on the rise. A report on the matter has been published by 22 world-leading marine scientists in a special section of Science journal. According to them, the combination of the threats related to CO2 puts the oceans at a very high risk of damages.

The researchers also believe that politicians who have been making efforts to deal with climate change have not done enough to deal with the impacts of climate change on the oceans.

The researchers say that the chemistry of the seas is changing faster than at any time since a cataclysmic natural event known as the Great Dying 250 million years ago. The rapid change in oceans' chemistry is attributable to CO2 from burning fossil fuels.

Nearly 30% of the carbon dioxide produced since 1750 has been absorbed by the ocean. They say that CO2 is a mildly acidic gas, a reason for seawater becoming more acidic.

"We are asking policy makers to recognise the potential consequences of these dramatic changes and raise the profile of the ocean in international talks where, up to now, it has barely got a mention", said Carol Turley, of Plymouth Marine Laboratory, a co-author.