Thesis: The sea has indeed become a bottomless rubbish pit
Perhaps we could interpret the question to understand that man is throwing all his rubbish into the sea. The sea has become a convenient place for man to dump his rubbish. If we accept that most of our rubbish makes its way into our drains, rivers and canals, then we would accept that the assertion is true. Rubbish is finally dumped into the sea. In that sense, we have made the sea a bottomless rubbish pit.
It is astounding that just a few centuries ago; the sea was thought to be the ultimate obstacle. It was so vast and endless. It was assumed that nothing could harm the sea. Then, industrialization hit. Factories sprouted up all over the world. The industrial progress, coupled with the age of discovery, was rapid. The sea shrank so rapidly that we no longer see it as vast. At the same time, these industries began dumping their waste into the sea. This practice continues till today.
The real harm is when inorganic materials are being dumped into the sea. Seeing that such materials are harmful, no country wants to dump the waste on its own soil. Industrial toxic waste pose serious problem to health and can cause erosion of the environment. As a result, the sea seems like a convenient place for countries to dump their rubbish. There are certain parts of the sea that belong to everyone. When interpreted in a more convenient way, it can be observed that these parts belong to no one. As a result, these countries are at full liberty to dispose of their harmful wastes in the sea. Usually, what happens is that the countries dump their wastes near the shores of unsuspecting, friendly countries. For instance, the United Nations launched an investigation in December 2013 against forty countries who had knowingly dumped their waste in poor, rural countries such as Africa. These offending countries pretend to be ignorant of the harm that their waste is causing. They ignore the fact that the toxic waste poses the threat of cancer and radiation. In such cases, the offenders are caught and brought to justice. Most of the time, they get away scot-free.
The damage caused is often serious. Thousands of species of marine life have become extinct and the food chains of various species of marine life have become disrupted, causing the death and destruction of other marine life and to the birds too. In the case of inorganic waste, the damage is overly serious. These wastes are difficult to neutralise and breakdown into organic forms. Industrial waste consists of such inorganic material and it is sickening to note that people who depend on the sea for survival and a source of living are greatly affected. For instance, in South Africa, whole tribes have had to alter their lifestyles in order to survive. Many though have fled to the city where they seek to rebuild their lives. While some are successful in their endeavours, most of them fail.