Population and Feeding the World (Human population growth consequences: …
Population and Feeding the World
-trawl net long line dragging on ocean floor
-longline- lots of hook
gill and drift nets
Coffee grown in the shade of tropical trees. Reduce cutting trees.
Sustainable Agriculture- producing food without depriving future generations. ex; organic.
Community-Supported Agriculture- system where members pay farmers weekly
Farmers Market- local farmers sell their produce
Famine- not enough food
Over nutrition- too much food
leads to anemia, over nutrition, and famine
not consuming enough fats, carbs, or protein
iron-meat; dark leaves
World Food Supply and Nutrition
Green Revolution- a large increase in crop yields achieved by developing new varieties of plants... ex: wheat
Shelter-belt - a row of trees planted to help block wind
Contour farming- planting crops around curves to reduce erosion. Soil is more fertile.
No-till farming- leaving the soil undisturbed
Feeding the World:
Subsistence Agriculture: - growing enough food to meet a family's immediate needs... even livestock.
smaller impact on enviroment
practiced in 3rd world countries and villages
use the sun, own labor, and large animals
only make what you need
Human population growth consequences:
economic loss, health impacts, social disruption
more fossil fuel use
global climate change
loss of biodiversity and ecosystem services
more waste and pollution
more resource extraction, manufacturing, and consumption
more agricultural production
war, conflict, refugees
Human population growth: these were the causes
All these 4 led to decline in death rates:
better medical care
more agriculture production
The number of group, or type of people or animal living in an specific area or country.
A situation that causes the growth of a population to decrease is called Limiting Factors.
Population Definition: is a particular section, group, or type of people or animals living in an area or country. Also the specified extent or degree to which an area is or has been populated.
The population greatly grew during the Industrial Revolution when the food productions multiplied.
Factors that Increase Population:
cheaper/ more affordable living
able to receive good education
Factors that Decrease Population:
expensive or unsafe living environments
education opportunities are scarce
The human population growth: the causes
All of these 3 led to birth rates remained high:
prohibitions on birth control
restrictions on women's right
historic need for farm labor
Effects of a Growing Population:
price increase on needed materials
living prices increase
limited resources become more scarce
more conformity to try and fit and accept everyone's way of living
Draft animals- large animals and used to pull equipment
Domesticated- bred for human use.
most common in wealthy nations
uses machinery that consumes energy
uses fertilizers, pesticides, irrigation and cause more waste
few workers needed
11% of Earth's land covered in farms
25% used for grazing
requires large amounts of water
"plantation agriculture" grow large amounts of a single crop. ex. bananas, cocoa, and coffee.
Crop Yield- size of harvest from a particular crop
Pasture- land used for livestock grazing
Dead Zone- an area in the ocean where marine life cannot survive
Plantation Agriculture- large scale farm that only grows one crop.. usually in tropical areas
Industrialized Animal Production:
Feedlot- small area where large numbers of livestock are raised
Range land- grass-covered land that animals can gaze on
layers of soil
humus-layer of soil
Siltation- the buildup of soil in an aquatic ecosystem