Humanity needs water to live, this is indisputable.
People are composed of a 66% water, it is clear that we need water to live.
Around the world more water than land, about 70% of the earth's surface is water, is the 97.14% of the amount of surface water (as the remaining 3% is frozen water) only 2.59% is water sweet, and this 2.59% about 2% is trapped in the form of ice caps. with which we have less than 1% of water supplied by the land we can use as potable or fresh water.
There about five ways to increase water supplies in a area. These are dams and reservoirs to store runoff water, bring the water surface in another area, groundwater out, converting salt water into fresh water (desalination) http://es.wikipedia.org/wiki/Desalacià ³ n improve efficiency of water use.
Water is a scarce resource that we need daily to many things such as drinking, washing dishes, showering, to pull the tank in service, cooking ...
But apart from domestic uses also need water for sectors like agriculture where we need water to irrigate crops and industry, as an ingredient in a product or as part of the production process.
From my point of view (critical and otherwise), I think there are many ways to save much more water. The problem is that this is an economically very costly process. Knowing
data that 97% of the water is salty we could spend all countries in desalination of the water to make it sweet and supply the population that is deprived of drinking water.
On the other hand, one could also invest in renewable energy from waves by sea, to create electricity. There are two ways to use it: a.
Suitable arrangements in coastal areas. Among the most prominent are the rectifier HRS, which tries to convert the up and down motion of waves in a linear flow of water that is able to drive a turbine. This is achieved through a system of locks and canals. B.
Devices that are installed offshore (floating) Among those who have the drive tire, called Masuda buoy, which consists of a tube into the water, towards the bottom and through which water can penetrate . It also includes an air turbine dual action moves so much under the influence of pressure as the movement of waves. You can also highlight the oscillating converter that is based on a sine wave particles move in circular paths.
But this is very expensive and is still used Hydraulic energy is cheaper because it put a generator on a dam as this is already done and the problem is that season of high consumption of electricity, like Christmas, opening floodgates of dams without draining only to create energy. Is it better to go a day without light or needlessly wasting water?
Another way to use water would also investing in renewable energy such as wind power http://es.wikipedia.org/wiki/EnergÃ-a_eà ³ lica and solar energy. Which from my point of view and would have to be placed in every city.
There are thousands of alternatives, but all with a high investment cost.
Samuelson told us in their widespread and successful parable, how a country can only produce guns or butter, faces the decision of how many units of each of these goods want to manufacture. You can, of course, devoted exclusively to the production of guns, can also produce only butter, or, finally, choose to produce a mixture of both.
I mention this because many countries choose to invest in "guns" because this gives them a high return, look no further mention the current war in Iraq where it has invested much money, and I wonder. Would it not have been better to invest in renewable energy to invade a country to take over non-renewable energy?. I think it does not take much time to think about the answer.
I thank you in advance Nadine http://nadineczernik.blogspot.com/ for doing that I would raise this issue.
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