If ethanol production in the United States continues to increase after 2015, it will need to rely on
A) even more corn that will not be available to feed the hungry people of the world.
B) second-generation biofuel using enzymes that convert cellulose to fermentable sugar.
C) manure and other animal wastes to generate methane, which in turn is used to produce alcohol.
D) any plant material and enzymes that convert sugars into cellulose, methane, and oxygen.
B
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What kind of growth is taking place in a population that doubles its size in 1000 years, and then doubles it again in 100 years , and finally doubles again in just 10 years?
A. exponential B. linear C. circumstantial D. negative growth
A food regime is the specific set of links that exists among food production, consumption, capital investment and accumulation opportunities. Since the 1960s, global agriculture has changed from a wheat and livestock food regime to a
A) fast food regime. B) fish regime. C) fresh fruits and vegetables regime. D) poultry regime. E) hot dish and casserole regime.
On an upper-level chart, normally we find warm air associated with __________ pressure, and
cold air associated with __________ pressure. a. high, high b. high, low c. low, low d. low, high
Computer models for the time between 1900 and 1970 can explain warming:
A) mostly natural causes B) mostly man-made causes C) there was no warming in that time frame D) both man-made and natural causes were equally important