For ! hurry though only have 5 of all the water on the earth, only about 3% is fresh water. 68% of all the freshwater is frozen as glaciers and is unavailable for human consumption. we have the technology to desalinate the ocean water to make it drinkable. why is it that we do not desalinate water on a large scale to increase the total amount of fresh water available for humans?

Explanation: Desalination of water is basically a process of purifying ocean water which is saline water to a water which can be used for drinking purpose.

Earth's surface consists of 70% of water which has only 3% of drinkable water. The desalination process on large scale involves boiling water and water vapor to a large extent which require very high energy.

The processes which are carried for desalination are: Reverse osmosis and electro-dialysis.

These processes are very costly and cannot be done on a large scale due to the economic wealth of the country.

Moreover, water is directly taken from the oceans and thus might harm marine life.

Therefore, it is not widely used.