1. Intro/Animals Unit 6: Food
Think back to…ethics (Chavez), runoff activity (pest/herbicides, fertilizer, etc.). What do we do with a growing population in the face of events like famine?
Bill Nye video:

2. Nutrition Background Malnutrition – not enough or variety of Calories
Humans use food for energy and building/maintaining body tissues
1 “Calorie” (capital C) is actually a kilocalorie (1000 calories)
Energy needed to raise 1 kilogram of water 1°C
Carbs (4 Cal/g), Proteins (4 Cal/g), Lipids (9 Cal/g)
Malnutrition – not enough or variety of Calories
Carbs are main source of energy, oils/fats also help form membranes, proteins help maintain structure

3. Nutrition Around the World
A healthy diet maintains the right balance of nutrients, minerals, and vitamins
Wheat, corn, rice, potatoes, soybeans are most widely produced— where’s the
meat?
Food efficiency – measures
quantity on a given area of land
with limited inputs
Animals might take up less space,
but what are they going to eat? (Stay
tuned—GMOs!)
New foods – glasswort! (can grow in salty soils)

5. World Food Problems Most people are not satisfied with “just enough”
Leads to impoverished people – often subsistence farmers (trying provide food for their families AND to sell)
Where are they going to get water for irrigation?
Population is growing faster than food (grain) production
Green Revolution (1950s) – new varieties of plants that produced MORE (did this help the subsistence farmers?)
Modern agriculture in developing countries. What are some other drawbacks?

6. Food from Animal Sources
Domestication – animals bred/managed for human use
Not limited to land species – fish and other aquatic organisms play an important role!
Overharvesting – catching/using more than a population can replace
No-Fishing zones – big improvements in a few years
Aquaculture – oyster farms (Chesapeake); manually create “ideal” situations for organism/population growth
Farm (for consumption) v. Ranch (raised to be released)

7. Ranches! (not so great for the environment)

8. Livestock
Provide meat (duh), but also leather, wool, and other products in developing countries
Integrated farming – duck poop to fertilize rice paddies!
Ruminants (cattle, sheep, goats) – animals that have 3-4 chambered stomachs
Cud – throw up their food to allow it to aid in their digestion; when we eat that meat, it aids in ours!
Factory farms (next slide)
India has a lot of cows but…