The oceans make up 75% of our Earth and is home to a wide range of plants and animals that thrive in marine ecosystems around the world. Thanks to human actions, these ecosystems face a mounting threat, far too inconspicuous, for us to observe. Ocean pollution, raise in its temperature and rampant overfishing have threatened many species and have pushed them to the brink of extinction. On World Oceans Day, perhaps it is time to reflect what roles these oceans play in helping life on the land and think about how our activities have disturbed the fragile balance nature maintains in the deep blue seas.