It’s the same way with flush toilets. sure, you save money and water on every flush. Unless you have to flush it twice. Or three times. As you often have to.
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Unless you change your eating habits (are vegetarians less... productive?) and of course, use only one square of t.p., as Sheryl Crow, I believe, once advised. And don’t buy name brand t.p.; generic clogs less!
Oh, what the heck. Let’s just turn back the clock to the Dark Ages. That will save energy. We can be happy as pigs in a ... pig pen.
Or the low-phosphate dishwasher detergents...saves unless you have to run the cycle twice.