Reusable versus disposable diapers

I've had the nagging feeling that my cousin in New England who uses primarily reusable diapers was more responsible than I, at least in the diaper issue. A new study, however, seems to assuage my sense of guilt:

[T]he London-based Environmental Agency concluded that disposable diapers have the same environmental impact as reusable diapers when the effect of laundering cloth diapers is taken into account.