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Study Review Sheet for NUFS Final

Study Review Sheet for NUFS Final - Study Review Sheet for...

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Study Review Sheet for NUFS Final Population: What are the demographic factors which influence demand for food? Age Structure: reflection of the underlying demographic conditions of the preceding decades and at the same time is an important determinant of future demographic patterns. What are population pyramids? What are they used for? A convenient way to visualize the age structure and the sex of the population What do population pyramids look like for a developing country? Rapid growth For a developed country? Slow growth What are dependency ratios? How are they calculated? Ratio of dependents to working age adults. Adult dependency ratio: percentage of the population 65 & over by the percentage of population between 15 & 65. Child dependency ratio: percentage of the population below 15 divided by the percentage of the population between 15-65. What are some solutions for overpopulation? Family Planning Clinics, Increased education of women, Increased availability and affordability of healthcare, More equitable distribution of access to resources such as land, jobs, food. What does DT refer to when we talk about population data? DT: doubling time in year What is TFR? TFR: total fertility rate Is global TFR on the increase or is it decreasing? Growth is slowing down globally. Global TFR: 1950’s =5.0; 1990’s = 2.7 How many people are we adding to the planet every year? globally rate of increase is still at 90 million people each year. Environmental Factors : Is cultivated land per person increasing or decreasing? But the balance between the two is shifting. Every year the world’s population gains nearly 90 million people, while farmland loses an estimated 25 billion metric tons of topsoil. How much land do we convert from agriculture to development every year in the US? In CA? California: 100,000 acres per year, one of the highest conversion rates in the US. United States: 3.2 million acres per year. What are aquifiers? Aquifers: are the underground layers of porous rock which will hold most of the world’s supply of fresh water . How does irrigation contribute to land degradation? What are some signs that we are seeing that point to water scarcity? Increased demand for water is pushing beyond sustainable yield of aquifers. Farming and other human activities may have siphoned off enough water from underground aquifers. Increased standard of living Inefficient use of water/waste of water Pollution less usable water
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How can we decrease our demand for water? Focus on decreasing the demand for water instead of supply of land and water: grow water-efficient crops stop subsidizing water eat lower on the food chain Average American requires 1760 lbs of grain/year to meet their nutritional needs Average Indian requires 440 lbs of grain/year Biodiversity/Bioinvasion: What is biodiversity? Biodiversity: Life at all levels. Short for “biological diversity”- describes the richness and variety of the natural world.
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