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Low carbon flying is a hard nut to crack, but solutions look possible. The most obvious one is use biofuel. Unfortunately, we saw on page 78 that the trade-off between fuel and food is incredibly steep. If the biofuel used was made from wheat, the amount of it required would be enough to meet the calorific needs of all the passengers for a whopping four years and would require 1.5 square miles of prime California land for a year to produce it13