Eine intensive Landwirtschaft ist nur möglich, wenn die Böden mit Stickstoff, Phosphor und Kalium gedüngt werden. Während Phosphor und Kalium als Salze abgebaut werden können, muss Stickstoffdünger aufwändig aus Stickstoff aus der Luft und aus Wasserstoff hergestellt werden, wobei die Produktion von Wasserstoff äusserst energieintensiv ist. Es werden dazu grosse Mengen an Erdgas oder – vor allem in China –
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