Population and Feeding the World (Ch.11 Feeding the World (Industrialized…
Population and Feeding the World
Ch. 6 Population
There are 7.6 billion people on this earth. It is increasing but the speed is decreasing.
Age structure is the classifications of members in a population.
The human population is not stable, it is always changing.
Countries that have high rates of growth have more young.
Changes that affect the number of population are death rate, birth rate, and irrigation.
Medicine, sanitation, and immigration can lead to the increase in human population in a country or region.
Somewhere around 10,00 and 12,000 years ago humans were living all over the globe in small loosely organized groups of hunter-gatherers.
Hunter-gatherers had to go with herds where they drift, pick up, and move when the resources of one area were exhausted.
Eventually, people in the Middle East, Africa, and Western Asia began to go into agricultural villages.
All organisms make a similar choice through how they reproduce.
The R vs K Selection Theory says that some organisms will reproduce in a way that aims for huge exponential growth.
K-Selected animals make a few babies and invest.
Species that reproduce in a way that leads to very fast growth are called R-Selected species.
Organic vs. Non Organic
Food can go organic when raised without artificial fertilizers or pesticides.
If the food comes from livestock, the animals have to be free of antibiotics or growth hormones.
Organic food is not genetically modified or treated with radiation.
Nutrients supply your body with energy and substances,
Nutrients is in fats, carbohydrates, and proteins.
If a food contains only organic ingredients, it can be labeled "100 percent organic".
If 95 percent of the ingredients are organic the product can be labeled as "organic".
If a food has at least 70 percent organic ingredients it doesn't get a seal, but it can be labeled "made with organic ingredients".
Ch.11 Feeding the World
Shelter belt: a row of trees planted to block wind
Contour farming: planting crops around curves
No-till farming: leaving the soil undisturbed.
Siltation: the buildup of soil in an aquatic ecosystem
Humus: layer of soil
Industrialized Animal Production
Range land: covered land that animals can graze
Feedlot: small area where large numbers of livestock are raised
Requires large amounts of water.
25% used for grazing.
11% of Earth's land is covered in farms.
Uses fertilizers, pesticides,and irrigation.
Uses machinery that consumes energy.
Most common in wealthy nations.
Smaller impact on the environment.
Practiced in 3rd world countries and villages.
Use the sun. own labor, and large animals.
Growing enough food to meet a family's immediate needs, even livestock.