chapter 11: feeding the world
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Chapter 11: Feeding the World. Nutrition. Food Security Macro vs. micro nutrients Malnutrition Undernutrition Overnutrition WHO | Obesity and overweight Malnutrition and Gender Inequality. Protein Energy Malnutrition. Marasmus Kwashiorkor. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 11: Feeding the World
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Nutrition
• Food Security
• Macro vs. micro nutrients
• Malnutrition
• Undernutrition
• Overnutrition – WHO | Obesity and overweight
• Malnutrition and Gender Inequality
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Protein Energy Malnutrition
• Marasmus
• Kwashiorkor
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Ways to reduce childhood deaths from hunger and malnutrition
• Immunize
• Breastfeed
• Prevent dehydration
• Provide family planning
• Increase education for women
• Provide Vitamin A
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Famine
• Sudan, Africa: Civil war since 1983
• Mother describes life in Southern Sudan
• Teaching Farming Techniques
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Animation: Land Use
PLAYANIMATION
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Green Revolution • Increased yields per unit area since 1940’s
Three steps: – Developing and planting monocultures,
selective breeding or genetically engineered crops
– Increased use of fertilizers, pesticides and water
– Increasing the intensity and frequency of cropping
– The Green Revolution: Waging A War Against Hunger
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Agriculture
• Where would you find the following types of agriculture and what types of crops are grown by each? – Traditional (low input)– Industrial (high input)– Plantation
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Fig. 13-4, p. 275
Plantation agriculture
Shifting cultivation
Industrialized agriculture
No agriculture
Intensive traditional ag.
Nomadic herding
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Traditional subsistence agriculture
Traditional intensive agriculture
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Industrial agriculture (high input)
•What are the high inputs required to make industrialized agriculture work?
•Tend to be monocultures
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Plantation agriculture• Type of industrialized agriculture• Problems associated with plantation agriculture
Tea plantation in MalaysiaCoffee plantation Kenya
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Organic Farming
• Food grown without the use of synthetic pesticides and fertilizers
• Disadvantages of organic farming?
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Three ways to decrease hunger, malnutrition and the harmful environmental effects of agriculture:
– Slow population growth.– Sharply reduce poverty.– Develop and phase in systems of more
sustainable, low input agriculture over the next few decades.
Figure 13-34Figure 13-34
Back to the Start
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Ungrazed Grazed Recovery
Metabolicreserve
Metabolicreserve
Metabolicreserveintact
Grazing
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Ungrazed Overgrazed Death
Metabolicreserve
Death
Most ofmetabolicreserveeaten
Overgrazing
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Producing More Meat• Rangelands vs. feedlots (Concentrated Animal
Feeding Operations - CAFO’s)
The Meatrix Meatrix 2 Meatrix 2.5 Grocery Store Wars
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Fig. 13-21, p. 289
Trade-Offs
Animal Feedlots
Advantages Disadvantages
Increased meat production
Need large inputs of grain, fish meal, water, and fossil fuelsHigher profits
Concentrate animal wastes that can pollute water
Less land use
Reduced overgrazing
Reduced soil erosion
Antibiotics can increase genetic resistance to microbes in humans
Help protect biodiversity
Hogs & Water Quality
Image of Hog Farms
Efficient or inefficient?
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Use of antibiotics and steroids in meat production
Animal Antibiotic Overuse Hurting Humans? - CBS Evening News - CBS News
Growth steroids (hormones): cattle and sheep
Milk Production hormones: dairy cattle (not beef cattle)
No growth hormones allowed for poultry (turkey, chicken and ducks) or pigs
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Fish farming in cage
Trawler fishing Spotter airplane
Sonar
Trawl flap Trawl
lines
Purse-seine fishing
Trawl bagFish school
Drift-net fishingLong line fishing
Lines with hooks
Fish caught by gills
Deep sea aquaculture cage
Float
Buoy
Fishing Methods
Turtle excluder device
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Fig. 13-24, p. 292
Trade-Offs
Aquaculture
Advantages Disadvantages
High efficiency Needs large inputs of land, feed, and waterHigh yield in
small volume of water
Large waste output
Destroys mangrove forests and estuaries
Can reduce overharvesting of conventional fisheries Uses grain to feed
some species
Low fuel useDense populations vulnerable to disease
Tanks too contaminated to use after about 5 years
High profits
Profits not tied to price of oil
Dan Barber Video
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Fig. 13-25, p. 293
Solutions
More Sustainable Aquaculture
• Use less fishmeal feed to reduce depletion of other fish
• Improve management of aquaculture wastes
• Reduce escape of aquaculture species into the wild
• Restrict location of fish farms to reduce loss of mangrove forests and estuaries
• Farm some aquaculture species in deeply submerged cages to protect them from wave action and predators and allow dilution of wastes into the ocean
• Certify sustainable forms of aquaculture
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Government Policies and Food Production
• Governments use three main approaches to influence food production:– Control prices to keep prices artificially low.– Provide subsidies to keep farmers in
business.– Let the marketplace decide rather that
implementing price controls.
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What is a subsidy? • Financial assistance from the government to
assist a business• Agricultural subsidies:
– Direct payments to farmers for certain levels of output– Price supports that keep prices higher to increase
revenue for farmers: Ex: the government sets a minimum price for sugar that it guarantees to sugar growers. If the market price drops below that level, the government makes up the difference.
– Protection against imports of certain products (sugar, dairy) to keep market for local producers
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Animation: Pesticide Examples
PLAYANIMATION
Persistence
Resistance
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THE GENE REVOLUTION• To increase crop yields, we can mix the genes
of similar types of organisms and mix the genes of different organisms.– Artificial selection has been used for centuries to
develop genetically improved varieties of crops.– Genetic engineering develops improved strains at
an exponential pace compared to artificial selection.
• Controversy has arisen over the use of genetically modified food (GMF).
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Mixing Genes• Genetic
engineering involves splicing a gene from one species and transplanting the DNA into another species.
Figure 13-19Figure 13-19
PBS - harvest of fear: what about this fish?
Proposition 37 in CA
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How Would You Vote?
• Do the advantages of genetically engineered foods outweigh their disadvantages?– a. No. The impact of these foods could cause
serious harm to the environment or human health.
– b. Yes. These foods are needed to combat world hunger.
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Solutions: Making the Transition to More Sustainable Agriculture
• More research, demonstration projects, government subsidies, and training can promote more sustainable organic agriculture.
Figure 13-35Figure 13-35