Full marks to WWF for their report on virtual water use today, which finds that when imports of virtual water – the water used to grow or manufacture goods that are then imported into the UK, sometimes from severely water-stressed countries – each Briton uses some 4,645 litres, making the UK the sixth largest net importer of water in the world. Only 38% of the UK’s net water use actually comes from Britain’s own resources, the report adds. (Press release; report.)
Virtual water’s a handy concept, not least in that it shows up where consumers’ real water impact takes place. Turning off the tap while brushing one’s teeth is all very well, but if you really want to have an impact, go vegetarian: here’s the amount of water it takes to produce selected foods:
1 kg of potatoes – 500 litres
1 kg of wheat – 900 litres
1 kg of rice – 1,900 litres
1 kg of poultry – 3,500 litres
1 kg of beef – 15,000 litres
(Source: the excellent Atlas of Water. Buy one today.) Agriculture’s easily the world’s largest consumer of water, too: it accounts for 70% of global water use, compared to 20% for industry and 10% for the domestic sector.
In case you wondering, WWF says the top 5 net importers of virtual water are Brazil, Mexico, Japan, China and Italy. And the top 5 exporters? The USA, Australia, Argentina, Canada and Thailand. (Sixth is India, where water tables are plummeting.)
