Chapter09

Chapter09 - Food and Agriculture Chapter 9 Debate this week...

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Food and Agriculture Chapter 9
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Debate this week Topic: Human Population Control It’s not so much fun if subject line doesn’t reflect content.
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Critical Analysis #2 is due next Friday the 29 th of February Topic: Agriculture and GMOs If you wish to revise CA#1, it must be handed in as a hard copy before 1PM on Friday 29 th of February Room 329 LSB.
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After studying Ch 9, you should Know diff b’wn famine and under- / malnutrition Know components of soil, how soil is degraded Know types of land degradation that result from poor agricultural practices (nutrient depletion, waterlogging, salinization, desertification) Understand organic farming and other aspects of sustainable agriculture
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World Food Supplies World food supplies have exceeded that necessary to match human population growth over the past two centuries ± Nutritional need is ~2,000 cal/person ± 1950 –2.5 billion people – worldwide, the average daily diet < 2,000 cal/person ± 2007 - 6.6 billion people - world food supply is sufficient to provide > 2,500 cal/person So why do we have famines on Earth?
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Hunger is ubiquitous About 1 in 5 people in the developing world are considered chronically hungry ± Chronic hunger in children can lead to permanently stunted growth, mental retardation, behavioral and other developmental disorders ± Poverty ( the ability to obtain sufficient food on a daily basis ) is the greatest threat to food security When rich countries distribute surplus food, it helps o/ short term but ultimately results in crowding, lack of sanitation, & epidemic diseases
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In many Asian, African, and So. American nations, local food production does not match local population growth Collapse of Soviet Union led to significant decline in food production Malnutrition, disease, and death rate are signs of famine ( food shortage, starvation, social disruption, and economic chaos ); caused by environment, politics, and social and economic inequity Under- & mal- nourishment in developing nations
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Lack of Essential Nutrients Malnourishment - nutritional imbalance caused by a lack of specific dietary components; iron deficiency is the most common dietary imbalance in the world ± Most people on Earth cannot afford to purchase an adequate variety of foods, especially perishable meats and vegetables; 20 million deaths / year
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Protein Deficiency Diseases Kwashiorkor –( displaced child ) due to not consuming the right foods; occurs mainly in children whose diet lacks high-quality protein ± Reddish-orange hair, bloated stomach Marasmus –( wasting away ) due to not consuming enough food; is caused by a diet low in both protein and calories ± Very thin, shriveled 750 million humans (12% human popu- lation) are affected Same aged children breastfed marasmus
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This note was uploaded on 04/22/2008 for the course BIOL 103 taught by Professor Brown during the Spring '08 term at VCU.

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Chapter09 - Food and Agriculture Chapter 9 Debate this week...

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