1. Water Supply

2. Vocabulary
Agriculture: All the work through which the natural environment is transformed into animals and plants that are useful to humans
Irrigation: a process that allows water to be supplied to crops when there is not enough precipitation
Precipitation: water from weather

3. Blue planet
The earth appears blue form outer space because 71 percent of its surface is covered in water
97 percent of this water is salt water leaving only 3 percent fresh water
Only 1 percent of that water is accessible to humans to drink
Most water is in the form of ice or too deep in the ground to be used

4. Water Shortages
Water flows abundantly on the planet but distribution and accessibility is uneven
While some parts of the world are well supplied others suffer from a lack of water
In countries suffered a shortage of drinking water
By 2025 this will rise to 48 countries and 54 countries by 2050

5. Water cycle
Water has been going through its natural cycle for millions of years
It does not disappear because it is constantly regenerated
On average 65 percent of the Earth’s precipitation evaporates
24 percent flows over the ground as runoff
11 percent infiltrates the ground

6. Water Cycle

7. Essential Resource
75 percent of the body is water. It needs 2-3 litres per day to survive
For other uses like bathing and other uses humans need access to 100 litres a day
Since the world constantly needs more food, agriculture yields must continually increase
When precipitation is scarce the fields need irrigation
Irrigation often comes from the ground water which could dry up over time

8. irrigation

9. Industrialization and Water Usage
Vast amounts of water are needed to manufacture some products
Once factories use this water they often simply put it back into the water system loaded with waste/pollution
Water pollution is a problem in bot developing and industrialized countries
However in developing countries there is often very little control on industries so they have no obligation to limit pollution

10. Water Consumption
We us 20 times more water today than early in the 20th century
Wealthy countries increase their water consumption through swimming pools, sprinklers or laundry
In Quebec we use 400 litres per person the world average is 137 per day

11. Water and the World
Currently 1.4 billion people have no access to drinking water
3 billion people lack adequate sanitary facilities
In the least developed countries women and children spend 4-6 hours a day fetching water
Diseases related to unsafe drinking water cause between million deaths per year
Though cities take up 1 percent of earths surface they use 75 percent of the water supply
Cities are also the major sources of pollution