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1 " The ability for a person to operate satisfactorily in a thing is dependent on how much he knows about that thing. Ignorance is a major cause of inability. "
2 " A certain amount of impatience may be useful to stimulate and motivate us to action. However, I believe that a lack of patience is a major cause of the difficulties and unhappiness in the world today. "
3 " Contaminated food is a major cause of diarrhea, substantially contributing to malnutrition and killing about 2.2 million people each year, most of them children. "
4 " Food and the way we grow it and produce it are a major cause of environmental degradation. "
