One of the names by which the Earth is known is «the blue planet». Seen from space, the Earth appears blue because of the abundance of water on its surface: three-quarters of the Earth is covered by seas and oceans, which is 361 million square kilometers of salt water. The seas and oceans contain virtually all the water on the planet, the rest being freshwater from rivers, glaciers, and ice caps.
The marine environment is huge, complex, and difficult to access. It is expensive and complicated to study, so our knowledge of it is limited. But today we know that the world’s oceans and their adjacent seas, as well as the biological and non-biological resources they contain, are a necessary element for the continuation of life as we know it in its present form. The sustainability of the air we breathe, the water we drink, the food we eat and the climate in which we live are conditioned by the oceans (Declaration of the Intergovernmental Oceanographic Commission of UNESCO – IOC – for the 2002 World Summit on Sustainable Development). It is therefore our duty to know the oceans well in order to protect them better.
4.5 billion years ago, there were countless volcanoes on Earth, whose activity expelled millions of tons of magma, a viscous, fiery liquid of melting rocks. The magma contained enormous quantities of gas that formed the first atmosphere, called primitive, rich in water vapor. As the Earth cooled, the water vapor condensed, that is, it became liquid and fell as a true deluge in the form of precipitation that accumulated in the hollow areas of the relief forming puddles, lakes and gradually originating the seas and the first oceans; this was 4,000 million years ago. Over time the composition of the oceans changed, but the amount of water they contain remains the same: about 1.5 billion cubic kilometers.
For a long time, we did not pay much attention to it and considered it natural to exploit marine resources without measure, to let unsafe cargo ships sail in its waters, to build in any way on its coasts… and without thinking of more than taking it for a garbage dump. Today we know that the ocean is fragile and that its capacity is not as infinite as it seems.
It is very simple: we need the ocean to live. If we ask too much of it, we risk destroying it. That is why it is so important that we respect it and have a balanced relationship with it. If we exploit its resources reasonably, without plundering it, considering its sometimes-changing mood, if we study it carefully and methodically, the ocean can bring us many benefits. Here is a book that will allow you to get to know this silent «blue world» fascinating and essential for the future of our planet.
I invite you to read Matias’ post with the topic of the day.
Finally, I encourage everyone to reflect on the concept of the day. No one else but us can re-signify our own being