Water: a challenge of the 21st century

Without water there is no life. Water covers 3 quarters of the earth surface and it is essential for the human basic needs (such as health and food) and for the farming activities. It has a crucial influence in the quality of human life and the maintenance of the ecosystems.

In our planet, there is 97% water in the oceans, in the clouds, in rain, in rivers, etc, but only 3% is consumable. Nowadays, in our world, with the growth of population, the consumption of water will increase, and also its demand, which will lead to an excessive use of it.

“At this moment, about 1,1 billions of people have no access to drinkable water. With the global warming this number will increase. It is predicted that within the next 40 years, about 2 billions of people will be affected by the lack of water. And this is a positive hypothesis. In the worst, will be affected 7 billions of people. “ (http://magus.blogs.sapo.pt/9254.html)

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