Well, taking account US-level use of water and electricity (eg. let the faucet run and wash the dishes leisurely, wasting water in the process).
Not sure it is as green as "have some predetermined amount of water at the ready and wash dishes with it", as is the case in much of the developing world (and could be an alternative for the developed world too if environmental costs were a concern).
Plus the cost of water+electricity to develop, pack, transport, etc a dishwasher could be big too.
Of course it could be premature optimization -- if 99.99% of the water is wasted in other uses.
Not sure it is as green as "have some predetermined amount of water at the ready and wash dishes with it", as is the case in much of the developing world (and could be an alternative for the developed world too if environmental costs were a concern).
Plus the cost of water+electricity to develop, pack, transport, etc a dishwasher could be big too.
Of course it could be premature optimization -- if 99.99% of the water is wasted in other uses.