The actual living space of air-breathing creatures is only 1% of all living space available on earth: shown here as a slither of green.
Global ocean coverage (blue) versus global landmass coverage (green).
Due to its immense depth, the global ocean makes up 99% of all living space available on the planet. In other words, if you add up all the lands surface and the narrow band of atmosphere that supports creatures who breath air, the total represents just 1% of the area where life can survive on the planet. The rest is all ocean.1
1 – ‘Sea Sick’, Alanna Mitchell (2008)