chapter 12 alec scaffidi. food security- having enough nutritious food to have a healthy life food...
TRANSCRIPT
FOOD, SOIL, AND PEST MANAGEMENT
Chapter 12Alec Scaffidi
What is Food Security, and Why is it Difficult to Attain?
Food Security- Having enough nutritious food to have a healthy life
Food Insecurity- Living with chronic hunger and poor nutrition
Chronic Under Nutrition or Hunger- Not having enough food to meet basic energy needs
Malnutrition- Deficiencies in protein and key nutrients, causing physical weakness, and higher risk for disease
1 out of every 6 people in developing countries suffers from chronic under nutrition or malnutrition
Extremes in Nutrition
High populations cause scarce resources
Dense areas of poverty causing low amounts of food
Poor growing conditions
Severe shortages of food or Famine
Other Extremes Over Nutrition-
Excessive food intake, causing excess body fat
1 billion people suffer from malnutrition while another 1.6 billion people suffer from health problems brought on by over eating
How is Food Produced?
3 systems provide most of our food Croplands- Mostly grains, produce 77% of
food, using only 11% of their land for food
Rangelands, Pastures, and Feedlots- Meat, produce 16% of food, using 29% of the world’s land
Ocean Fisheries or Aquaculture- Fish 7% of food
Farm Food
Of 50,000 edible crops, 14 of them supply 90% of world’s food calories
Big 3 are wheat, rice, and corn 2/3 of world survive on those 3 crops Only a small amount of animals are used
for food
How do We Keep Up?
Industrialized Agriculture or High Input Agriculture- Many resources used to mass produce crops for consumption, usually specializing in one crop
Plantation Agriculture- Mass growing of cash crops ($$$) such as bananas, coffee beans, and other exports
Most Industrial agriculture happens in rural areas in developed countries, while plantations are in developing countries, mostly in the tropics
Types of Agriculture
Traditional Subsistence- Growing enough to survive
Traditional Insistence- Inputs used to produce more than needed in order to make a profit
Polyculture- Growing multiple crops at once Slash and Burn- Clearing an area by cutting
existing crops and burning them and using soil for more agriculture
Green Revolution- Since 1950, the industrialization of agriculture, causing higher crop yields
Meat Production About ½ of meat comes from
livestock grazing on grass Other ½ comes from feedlots,
confined animal feeding operations (fattening up for slaughter)
Industrialized meat production, produces more meat, however a lot of farmable land is used to produce less food than what could be produced
Fisheries
Fishery- concentration of aquatic species raised solely for harvest
Aquaculture- raising marine species in confined space underwater
Fisheries are the world’s fastest growing type of food production
That rise in production is called the blue revolution.
Problems in Food Production
Biodiversity Loss Soil Erosion Polluted water from pesticides Emissions from machinery polluting the
air Pesticide residues in food we eat
Soil Erosion Movement of soil components
to another place by wind or water
Topsoil is removed resulting in loss of soil fertility and pollution of water from sediment build up
Loss of soil results in desertification (resulting from human activity) and salinization (soil degradation)
Water and Industrial Problems
Over watering results in waterlogging Without adequate drainage, waterlogging
causes runoff of soils and pesticides to bigger water supplies
Higher amounts of industry causes high amounts of pollution
Genetic Engineering
With higher demand for food, industries have turned to genetically modified food
Modifying the food produces more of the food but cause major damage to the species that are modified
Chimeraplasty- Inserting a chemical instructions to genes, giving the animal desired traits
These genetic mutations lead to many problems such as irreversible ecological effects, harmful toxins in food, newer allergies, lower nutrition and more
Industrialized Meat
Advantages- More meat, higher profits, less land used, reduced overgrazing, reduced soil erosion, protection of biodiversity
Disadvantages- Large uses of grains, fish meal, and fossil fuels, as well as Greenhouse gasses, animal wastes causing pollution, and genetic alterations causing problems in humans
Industrialized Fishing
Advantages- Highly Efficient, High yield in small volume of water, reduces overharvesting of fisheries, low fuel use, and high profits
Disadvantages-Uses a lot of land, feed, and water, produces a large amount of waste, can destroy wetlands, dense populations vulnerable to disease
Pests and Pesticides
Pest- Any species that interferes with human welfare
Pesticide- Chemicals used to control or kill undesirable animals
Rachel Carson- Wrote the book Silent Spring, exposed pesticide problems
Advantage to pesticides- Increase food, profitable, and work fast
Disadvantages- Kill natural pest enemies, pollute environment, harmful to wildlife and people
How Can We Produce Food More Sustainably
Soil Conservation- Using a variety of ways to prevent soil destruction
Terracing- Planting on sloping surfaces to prevent soil erosion
Strip Cropping- Planting one crop that protects another strip of crops
Alley Cropping- Planting in alleys between trees which reduce water loss
Windbreaks- Planting to protect wind erosion
Restoring Soil Fertility
Organic Fertilizer-Made from plant and animal waste
Made from- Animal Manure, green manure (plant wastes) and compost (broken down organic material)
Inorganic fertilizer- made from various minerals
Sustainable Organic Agriculture
Organic Agriculture- crops grown with little or no pesticides
Produces More- High Yielding polyculture, organic fertilizers, biological pest control, efficient irrigation, and perennial crops
Decreases- soil erosion, aquifer depletion, overgrazing, overfishing, loss of biodiversity
Case Study: Ecological Surprises
In 1955 the chemical dieldrin was sprayed in Malaysia. The chemical killed malaria-carrying mosquitoes, cockroaches and other insects. Lizards who fed on the chemical infected insects also began to die, setting off an ecological chain reaction diminishing the cat’s food supply, causing cats to die, and allowing rats to over run the city. All of that to get rid of some bugs.