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TETRA PAK <strong>Magazine</strong><br />
3<br />
Precipitation Winds Evaporation Precipitation<br />
How much water do humans need?<br />
A commonly used estimate of the average amount of water<br />
ingested by a person in a day is two litres. This means that<br />
the average person ingests 730 litres per year. The entire<br />
human population thus takes in about 5.2 trillion litres, or<br />
5.2 cubic km. Imagine a huge cube of water that's a little<br />
under two km wide, two km deep and one and a half km high<br />
– that’s how much water humanity drinks and eats in a year!<br />
Although, when you consider that Peru and Bolivia’s Lake<br />
Titicaca contains 893 cubic km, America’s Lake Superior<br />
contains 11,600 cubic km, and Russia’s Lake Baikal – the<br />
biggest - contains 23,615 cubic km, you realise that humanity’s<br />
drinking water needs are just a drop in the bucket compared<br />
to even the little portion of the Earth’s water that is fresh. So<br />
why is it that we have a water problem? Surely all we need is<br />
a small lake?
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