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Many people have become aware of the need to cut down on the amount of waste that they are producing in order to lessen the impact on the environment. As a result, many parents have decided to cease using disposable nappies (diapers) for their babies and have gone back to using washable, re-useable nappies instead. However, they are misguided. The amount of energy used in washing nappies has as much negative environmental impact as the disposing of nappies. Therefore, parents might as well make their life a bit more pleasant by using disposable nappies.

Which of the following, if true, would most weaken the above argument?