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The oceans represent more than 70% of the earth's surface and are home to 97% of the water that exists on the planet. Salt water is home to thousands of plant species, animals, bacteria and other microorganisms, as well as an important source of natural resources ( energy, food, minerals, etc.). Unfortunately, the human being has found another way to take advantage of these immense aquatic spaces, to turn them into the new human landfills, which translates into the pollution of the oceans. Europe is home to 44 species of marine mammals including whales, dolphins, porpoises and seals, although the diversity of species varies between regional seas. Of these, 36 species are whales, dolphins, and porpoises — collectively known as cetaceans — can be seen in Europe’s seas. Key words: climate change, endangered marine species, pollution and renowable energies.