Pollution is the introduction of a contaminant into theenvironment. It is mostly created by human actions, but itmay be caused by natural disasters aswell. It is known that pollution leads to depletion of the ozone layer, global warming and climate change.There are three main types of pullution: land pollution; air pollution and water pollution. Land pollution is thedegradation of Earths land surfaces. It is mainly caused by human activities and their misuse of land resources.
Air pollution is the release of chemicals and particles into the atmosphere. Stratospheric ozone depletion due to airpollution has been recognized as a threat to human health as well as to the Earths ecosystems. Indoor air pollution and urban air quality are also listed as two of the worlds worst pollution problems. The water pollution is the subject that we will approach in this work.
Water Pollution The seas are about 71% of the surface of the planet, and housesthousands of species that need water and its ecological niches to survive. Despite the existing underwater life, the interference of man and his disregard for his life greatly affects the problem. There are no mysteries about sea pollution. The spill of non-treatedwaters and objects that are discarded into the rivers, are mainly the great contribute to pollution of the seas. Most of these materials released into the oceans, take a long time to decompose, making difficult the underwater life, because the living beings that live underwater need their natural habitat healthy for.
For the underwater biodiversity to survival, it is essential clean water. It is essential to life. So there should be a concern to preserve to prevent contamination. To the authorities responsible for the municipality it their function building ETARs for treatment of wastewater.We, as consumers, it is us aware (environmental awareness) the importance of water for life on planet Earth, the dangers of contamination and the need to preserve it.
What causes pollution? Most of the pollution in the River Tagus iscaused by organic waste. Industries, water treatmentstations, power stations, domestic sewage andindustrial, dump wastes on the river. However,other factors also contribute to the pollution of theRiver Tagus, such as wastes of heavy metals,radioactive substances and polluted affluents likeTrancão river. When toxic substances enter in waterbodies, they get dissolved or lie suspended in wateror get deposited on the bed. This results in thepollution of water.
Consequences of pollution Pollution has a detrimental effect on any livingorganism in an environment, making it virtuallyimpossible to sustain life. This effects are not onlydevastating to people but also to animals. The mostpolluted area is the River Tagus estuary. It is a seriousproblem because this area is habited by manywildlife species that consume polluted water, gettingsick and may even die.
Pollution control At Expo 98, there was a concern with the qualityof the river water and proceeded to clean up. Therewas money, techniques and options that allow it tobe a successful project. It was just for clean up theLoures municipality, but later some municipalities ofTagus Valley were also added to the project to cleanup. However, disagreements meant that the projectwas never completed. There are also ETARs thatprevent pollution of Tagus.