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The water content of things, including the food we eat and the products we buy, might surprise you.
Since about 30 percent of the world’s population lives in regions that struggle with water shortage, being aware of our individual and collective water usage can effect change.
We need water to grow everything we eat and to produce almost all the products we use every day. The water used comes from rain or snow melt and is added to the food growing or production process of things.
This hidden water is called “virtual water” and, according to Stephen Leahy in Your Water Footprint: The Shocking Facts About How Much Water We Use to Make Everyday Products,” each of us uses far more virtual water than the ‘regular’ water we can see, feel and taste.”
According to Leahy, the daily water usage for the average American is about 2115 gallons of water a day, which includes the direct amount of water use (drinking, cooking, bathing) as well as the virtual (i.e., hidden) water use.
Unfortunately, it is difficult, for many reasons, to determine highly accurate numbers for the water content of things.
For example, there are a wide variety of techniques for manufacturing and food growing processes that are used worldwide.
Thus, the amount of water used can vary greatly depending on how and where the food is grown or the product is produced.
In addition, the water-usage numbers can vary significantly depending on how far you go back in the food-growing chain or production process.
For example, when it comes to beef, some measurements will only take into consideration the amount of water the cows drink. But the amount of water required to grow the food that the cows graze on is huge and accounts for over 90 percent of the large footprint for beef production.
Thus, the following are estimates of water content for some common foods and products.
We are using liters (1 liter = 1.06 quart) as the common measurement for easy comparison.
Each of us can make a difference in reducing the world water shortage by being aware the water content of things and making small changes.
For example, from a freshwater resource perspective, it is more efficient to obtain calories, protein and fat through crop products than animal products.
This doesn’t mean that everyone must become vegans, but if many people reduced their consumption of beef, for example, the impact would be significant.
In addition, most of the sustainable movements focus on the three R’s—Reduce, Reuse and Recyle. These terms are equally important in terms of the water footprint of foods and products.
In general, it means to minimize waste (and perhaps buy less stuff!), reuse available resources (consider shopping at second-hand stores more often), and recycle the waste.
Peter Gleick; The Pacific Institute; The World’s Water 2008-2009: Water Content of Things.
Waterfootprint.org: Product Water Footprint
Waterfootprint.org: Water Footprint of Crop and Animal Products: A Comparison
Return from What is the Water Content of Things to World Water Scarcity
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