The size of habitats needed for their protection, including consideration of MPA networks across ocean basins, will give assistance to many other species as well.

BBC: Saving the seas for marine mammals

But surface temperatures in all six of the ocean basins he examined (the north and south Atlantic, Indian and Pacific oceans) have increased by about half a degree Celsius.

ECONOMIST: Climate change: Oceans apart | The

About 100 million years ago, sea levels were about 300 metres higher than at present because of changes in the volume of ocean basins due to movement by the Earth's techtonic plates.

BBC: Looking for the greenhouse signal