According to a satellite NASA surfaces marine biological death increased by 15%. between water and land, deserts now cover 40 percent of the planet's surface.
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was revealed in a study on the health of the oceans being published in the journal Geophysical Research Letters.
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Viewed from space, the sea without life takes on a dark blue color, in contrast to the green chlorophyll of the areas in which the food chain prosper in peace. The paradox of the desert in the water is added to that of the planet became too blue, without which they draw sustenance from that green fish and cetaceans. The warming of surface water that blocks the movement currents and the exchange of nutrients between the layers of the ocean is not the discovery of today.
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Over the past 9 years, deserts have expanded at a speed 10 times higher than expected. In Italian waters, the situation is even worse: "The extension of desert areas in the Tyrrhenian and the Adriatic is around 20 percent," said Silvio Greek, researcher ICRAM, Central Institute for Scientific and Technological Research Applied to sea. "The interruption of water flow acting on an ecosystem already compromised by over-fishing and pollution."
The lack of cold winters prevent the water surface to cool and then to sink to the lower layers of the oceans. Out of the depths, usually, is the warm water to rise, leading to the surface is rich in nutrients. The decomposition of marine organisms in fact fills the depths of salts such as nitrates and phosphates: substances that are in the depths be unused, while on the surface, combined heat and sunlight, to allow photosynthesis to trigger in some tiny single-celled algae. It is with the transformation of inorganic salts in organic elements such as beginning the phenomenon of life.
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What happens on the ground with the chain of grass, herbivorous animals and carnivorous predators, repeat (Or at least should) in the oceans. In areas that appear green in the eyes of a satellite feed on unicellular algae living things bigger and more complex, up to whales. But at the heart of the great ocean, far from the mouths of the rivers that issue, however, some form of nutrient, even drugged by pollution, the NASA satellites every year have found more and more skimpy green areas. The absence of chlorophyll has sliced \u200b\u200bcleanly through the food chain, removing one after another all living species from the blue areas.
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The extension of the deserts in the oceans - the study reveals - is linked to the increase in surface temperature. The phenomenon is spreading rapidly, especially in the North Atlantic. But no basin is saved, except the South Indian Ocean. Each year, on average, the blue area of \u200b\u200bthe desert grows to 800 thousand square kilometers. And to think that one of the strategies devised to combat the greenhouse effect consists in increasing its population of unicellular algae, casting iron and other nutrient salts in the ocean. Accelerating photosynthesis, in fact, scientists hope to increase the absorption of carbon dioxide by algae, cleaning up the atmosphere by greenhouse gases, which remains the number one suspect in the phenomenon of global warming. Increasingly convinced that the changes taking place are the work of man and his activities facilities are also scientists of the Geological Society of America.
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Over the past two centuries, so deep were the scars inflicted upon the Earth and its atmosphere of our species, which U.S. geologists have proposed to rename the current was "Anthropocene" ages of man. Characterized by high concentrations of lead in air and water, a flood of carbon dioxide and other greenhouse gases in the atmosphere, rivers and dams that harness to prevent sediment flow into the sea of \u200b\u200bfertilizers, poor ocean of life and a more intense blue.
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