While for guys this a somewhat straight forward issue because long hair is not currently the fashion of the day, it is a totally different issue for women.
Yes short hair is more common among women today than it was 20 or 30years ago. However, this is the case largely because of stylistic and practical choices, not a conscious environmental choice.
So how does shorter hair help the environment? Let us do a rough sample calculation, let us say that a half length hair requires 1/3rd less shampoo than full length hair, this means the amount of shampoo that gets used or dumped in the sewers every year would be reduced by 624375ltrs(assuming 14 x 250ml bottles of shampoo per year, and half a billion women.)
The other important part, and this is helpful on the global warming front in terms of CO2 emissions, is in the packaging used, which is usually made from HDPE or other some other plastic materials. Using the same calculation from above, 2310000 bottles of shampoo can be saved per year.
A third area where shorter hair my contribute to energy saving is the fact that it takes less time to wash shorter hair, meaning less hot water used and in turn less energy consumed.
A final area where shorter hair might help the environment is in the fact that shorter hair requires less energy for drying.
These calculations do not take into consideration the fact that many women already have short hair, many woman are happy with their long(er) hair, or the fact that long can be advantageous in cold weather.
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