Bok
04-12-2012, 09:18 PM
Scientists track the movement of ‘virtual water,’ used in the production of goods and exchanged among nations
More... (http://www.sciencenews.org/view/generic/id/339838/title/FOR_KIDS_Water%E2%80%99s_worldwide_travels)
More... (http://www.sciencenews.org/view/generic/id/339838/title/FOR_KIDS_Water%E2%80%99s_worldwide_travels)