Hi Guy, you make some excellent suggestions, but I think you missed one of the main issues that Prof Arjen was making, we have to start making drastic changes in industrial (especially food production) processes.  This is where a strong focus needs to be placed.  Instead of using water once and discharging it to the sewers, industry needs to both reduced water needs and find ways to use water 3 or 4 times before discharging.  This is all possible, but at a cost which will be need to be passed on to the consumer.  So with higher priced but water efficient food production, we will all of necessity eat less meat and chocolate (aaah - my wife will complain about the chocolate).

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Hi Guy, you make some excellent suggestions, but I think you missed one of the main issues that Prof Arjen was making, we have to start making drastic changes in industrial (especially food production) processes.  This is where a strong focus needs to be placed.  Instead of using water once and discharging it to the sewers, industry needs to both reduced water needs and find ways to use water 3 or 4 times before discharging.  This is all possible, but at a cost which will be need to be passed on to the consumer.  So with higher priced but water efficient food production, we will all of necessity eat less meat and chocolate (aaah - my wife will complain about the chocolate).