How much water does it take to make a bottle of water? The
answer, critics claim, is greater than the International
Bottled Water Association (IBWA) admits. According to the results of a recently
released IBWA report, the bottled water industry needs 1.39 liters (L) to
produce 1 L of bottled water. That's less water than is required for soda (2.02
L), beer (4.0 L), wine (4.74 L), or hard liquor (34.55 L).
So do environmentalists prefer Evian to Coca-Cola, microbrews
to merlot, and anything that's drinkable to Jack Daniel's and Jim Beam? Let's
quench our thirst for analysis before buying anyone the next round. The water
activists who dispute the IBWA's calculations accuse the beverage industry
of underreporting the size of its "water footprint" as well as its "carbon
footprint". Do they make a convincing case?
Through a Glass Darkly
Environmentalists have long argued that bottled water is
wasteful because it's resource-intensive. Some activists have even claimed that
bottled water is bad for the environment because plastic bottles require
petroleum, a fossil fuel. Critics also cite pollution ranging from the Great
Pacific Garbage Patch to plastic water bottles that, when improperly discarded,
litter city streets.
As conneissuers of mineral water will note, however, their favorite
products aren't always packaged in plastic. There's Perrier with its
signature green glass bottles, of course, but there are also brands such as
Hildon and Saint Géron
that feature clear glass. These mineral waters may be more popular in Europe
than North America, but let the record show that not all bottled water is
packaged in plastic.
Petroleum and PETE
If you take a look around your office though, you're more
likely to see co-workers sipping water from clear plastic containers. Most of
these disposable bottles are made of polyethylene terephthalate, (PET or
PETE), a lightweight plastic that's clear, tough, and shatterproof. As the American
Chemistry Council explains, PET plastics also provide an
excellent barrier to oxygen, carbon dioxide, and water.
In recent years, PET water bottles have
been criticized because of their alleged health effects. The Canadian
Cancer Society separates myths from facts, but let's keep
our focus on the environmental debate. Like many other plastics, PET is made of
petroleum hydrocarbons. This material is formed into bottles through blow
molding or even thermoforming - processes that often require fossil fuels.
Carbon and Water Footprints
PET plastic's "carbon footprint" doesn't
end there, however. After water bottles are filled, they're moved to market by
methods, such as rail or trucking, that typically burn fossil fuels. From
production to transportation then, bottled water consumes resources that some
environmentalists would prefer to leave in the ground. Even the extraction of
the oil that's used to make PETE requires fuel.
For critics of the IBWA's recent study,
however, there's also a "water footprint" to measure. Although the industry
claims that producing a 1-L bottle of water requires just 1.39-L of H2O, water
activists cite processes that the IBWA has overlooked. For example, just drilling
for the oil that's used to make PET bottles requires groundwater. Water (and
energy) is also needed to make paper labels and adhesives.
Then there's the water used in PET
manufacturing to consider. According to the Pacific Institute,
"twice as much water is used in the production process", meaning that "every
liter sold represents three liters of water". The group's Bottled
Water and Energy Fact Sheet does not explain how
it calculated this estimate, and reserves most of its number-crunching for
energy consumption.
Thirst for Knowledge
So how much water does it really take
to make a bottle of water? If the IBWA's estimate is too low, what would be the
environmental impact of using bioplastics instead of PET? Are activists who
would leave all of the petroleum in the ground accounting for how tractors typically
burn gasoline,
diesel fuel, or LP gas? Moving bioplastic bottles to market would
also mean using vehicles that burn fossil fuels.
The bioplastic production process is especially
important to consider, both in terms of energy usage and water consumption. For
the sake of argument, let's assume that the bioplastics used for water bottles
are all made in carbon-neutral factories. How does a bioplastic such as
polylactic acid (PLA), which is derived from corn, compare to PET in terms of
water requirements?
As the eco-friendly organization World Centric
reports, producing one pound of PET plastic consumes 7.44 gallons of water.
Producing PLA plastic is less energy-intensive and has lower carbon emissions,
but requires more water - 8.29 gallons to be precise. PLA bioplastic also
requires more water than polypropylene (PP), a thermoplastic polymer that's
used in commercial and industrial applications.
What do you think?
About the
Author: Doug Sharpe is the President of Elasto Proxy, Inc. (Boisbriand, Quebec, Canada), supplier of sealing
solutions and custom-fabricated rubber and plastic parts to a variety of
industries, including green power, automotive, aerospace, and defense.
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