Human survival depends on a sustainable water cycle for both blue and green limits

Figures mentioned below are km3/yr

‘Blue water’ refers to surface and ground water

 

 

’Green water’ is what is available to plants

from the soil

 

 

 

 

 

Evapotranspiration happens when water from land and plants is transferred into the atmosphere

Precipitation

(rain)

-94,000

-63,000

Forest

-57,000

Rainfed

agriculture

-5,800

-38,000

The accessible blue water for human use is is limited to 12,500km3/year

-12,500

Irrigated

agriculture

-16,000

Industry

-400

Urban

-350

Figures mentioned below are km3/yr

‘Blue water’ refers to surface and ground water

 

 

’Green water’ is what is available to plants from the soil

 

 

 

 

 

Evapotranspiration happens when water from land and plants is transferred into the atmosphere

Precipitation

(rain)

-94,000

-63,000

Forest

-57,000

Rainfed

agriculture

-5,800

Irrigated

agriculture

Industry

Urban

-38,000

-12,500

-16,000

-400

-350

The accessible blue water for human use is is limited to 12,500km3/year