Saturday, 1 September 2012

Water and residues – Azores (Portugal)


All known forms of life depend on water. Water is vital both as a solvent in which many of the body's solutes dissolve and as an essential part of many metabolic processes within the body. Without water, these particular metabolic processes could not exist.

Therefore Azoes (Portugal) Post issued the stamp set features four  figures that can remind the people to care about the availability and quality of water in the world. The issue consist of 4 postage stamps and released on September 30, 2011.

4480a
The human body contains from 55% to 78% water, depending on body size. To function properly, the body requires between one and seven liters of water per day to avoid dehydration; the precise amount depends on the level of activity, temperature, humidity, and other factors. Most of this is ingested through foods or beverages other than drinking straight water.
It is not clear how much water intake is needed by healthy people, though most advocates agree that approximately 2 liters (6 to 7 glasses) of water daily is the minimum to maintain proper hydration.



4480c
Water is fundamental to photosynthesis and respiration. Photosynthetic cells use the sun's energy to split off water's hydrogen from oxygen. Hydrogen is combined with CO2 (absorbed from air or water) to form glucose and release oxygen. All living cells use such fuels and oxidize the hydrogen and carbon to capture the sun's energy and reform water and CO2in the process (cellular respiration).




4480b
Safe  water is essential to humans and other lifeforms. Access to safe water has improved over the last decades in almost every part of the world, but approximately one billion people still lack access to safe water and over 2.5 billion lack access to adequate sanitation. There is a clear correlation between access to safe water and GDP per capita.

However, some observers have estimated that by 2025 more than half of the world population will be facing water-based vulnerability. A recent report (November 2009) suggests that by 2030, in some developing regions of the world, water demand will exceed supply by 50%.

Water plays an important role in the world economy, as it functions as a solvent for a wide variety of chemical substances and facilitates industrial cooling and transportation. Approximately 70% of the fresh water used by humans goes to agriculture.

4480d
The management of residues as part of wasted material from the side-effect of all human activities in the world is a crucial problem in relation to keep the healthy environment.

In remind to  the water cycle or the hydrologic cycle (refers to the continuous exchange of water within the hydrosphere, between the atmosphere, soil water, surface water, groundwater, and plants),
the interaction between water run-off and soil properties is very important facts to be deeply considered to maintain continuously.

Water run-off often collects over watersheds flowing into rivers. Water runoff and soil properties have affected the quality of soil water. Therefore we have to manage all residues of our activity in the world including the residues of home activities daily, and the residues of the industrial activity before they wasted directly to the soil or river or air.

Example we have to divided into several categories for solid wasted, red for solid dangerous chemical waste ( dry battery , etc), green for glass waste or unused glass material, yellow for plastic unused waste, blue for unused boxes made from paper.

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