Poor people today pay a greater proportion of their incomes for cereal foods (wheat,rice,corn)than they did just 30 years ago.
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Q31: During the past 30 years,per capita food
Q32: During the 1990s,the rate of increase of
Q33: Slash-and-burn agriculture is primarily a system of
Q34: Many soil quality functions must be measured
Q35: The proportion of the population of developing
Q36: Worldwide,excesses and/or deficiencies of water reduce crop
Q38: Shifting cultivation is a relatively new cropping
Q39: There are more hungry people on Earth
Q40: Representative shifting cultivation systems today permit more
Q41: Biofuel production form plant cellulose is likely
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