elective geography food resources lesson 6 final

1. CBSS Humanities
Flip Classroom Package
Lesson 6

2. Technological advances
• Green Revolution
– The use of technology to increase productivity of
agriculture.
– Started in the 1960s.
– Key success is in the Less Developed Countries
(LDCs).
– 4 key pushes
• High-yielding varieties
• Fertilisers and pesticides
• Improved irrigation
• Mechanisation

3. HYV varieties
• Strains of crops with increased growth rate.
• Developed through cross-breeding of selected
varieties
• Bred for favourable characteristics.
– Resistance to pests and diseases
– Short growing season.
– ‘wonder rice’ - 100 day rice
– IR8 (HYV rice) promoted across Asia, success in
India.

4. Fertilisers
• Substances added to provide nutrients.
• Solution to soil nutrient depletion.
–Commercial farms do not have allowance
for fallow
–Land is not allowed to recover
• Fertilisers reinstate the nutrient in the
soil, helping the crop yield of HYV.

5. Pesticides
• Chemicals to kill insects and small animals
(pests).
• Herbicides kill weeds (plants).
• Large amount of pests / weeds can decimate
complete yields.
• Use of Pesticides and Herbicides will help
maintain the crop yield.

6. Irrigation
• Manmade supplying of water to land.
• Introduction of water to arid areas
– Areas with minimal water supply
• Increased arable land worldwide
• Reclaiming desert areas as agricultural land
– Libya, Great Man-made River.
Read Pg 135
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video

7. Mechanisation
• Used of advanced machinery to perform
manual tasks.
• Speeds up processes
• Increases efficiency
• Reduces reliance on human labour.
• Combined Harvester, Planes, etc.
Click to watch
a video on
technology

8. Genetically modified food (GM)
• Food crops that have been genetically modified.
• Genes are selected based on predetermined
criteria.
• Transplanting of genetic material from different
organisms.
• Search for positive characteristics that would
assist in :
– Faster rate of growth
– Better quality of product

9. 2 stages of GM food development
HYV crops (1960s – present) GM crops (1990s – present)
Method of
development
• Cross-breeding • Alternation of genes
Benefits • Shorter growing season
• Resistant to pests and
diseases
• Shorter growing season
• Resistant to pests and diseases
• Resistant to extreme weather
conditions
• Health benefits
Examples • Super rice
• Wonder rice
• FlavrSavr Tomato
• Golden Rice
• BT-cotton
• BT-corn

10. Super Rice
Video
Flavr Savr
Tomato
Video
BT Corn
Video

11. Effects of continuing intensification of
food production?
• Intensification of food production brings
many benefits.
• It increases the total amount of food
produced.
• With extended intensification, there is also
large scale environmental damage.
• Waterlogging – situation where too much
water seeps into the soil and cause the soil
to be over-saturated. Roots drown.

12. Salinisation
• Water added during irrigation evaporates and
leaves salt behind.
• With insufficient drainage of excess water,
groundwater rises and brings up dissolved
salts.
• Victoria, Australia. Combination of tree
clearing and irrigation led to salinisation of
farmland.

13. Eutrofication
• Presence of excess nutrients in water leading
to algae bloom.
• Algae depletes oxygen and blocks sunlight
from aquatic plants.
• Large scale death of aquatic plants and
organisms.
• Decomposition of aquatic organisms lead to
further depleting of oxygen.

14. Measures to reverse eutrophication
• Control measures to prevent nutrients from
reaching the water bodies.
– Runoff management, use of hard engineering
measures to prevent runoff from reaching the
water bodies.
• Raising awareness through education
– Education in schools and public education
campaign.

15. Take a Breather
• Click on the icon below and view a couple of
short videos on Eutrophication.
Video 1 Video 2

16. Consequences of development of
GM crops
• Long-term impact on human health unknown.
• Cultivation of GM crops restricted in some
countries like Peru.
• Most countries require clear labelling for
products made from GM crops.
• Some countries ban the sale of GM crops.

17. Benefits GM crops bring
• Increased income for farmers
–GM increases productivity
–Pest resistant crops save money on
pesticides
–Higher crop yield brings higher
income.
•BT-cotton
Click on me
Watch BT
Corn!

18. Nutritional benefits
• GM allows for modification to have
higher nutrition.
• Golden Rice (higher Vitamin A)
• Able to help reduce blindness.
• Large nutritional benefit for LDCs.

19. Decreased Environmental Pollution
• GM crops reduce dependence on chemical
pesticides.
• Reduce the potential of environmental
pollution.
• BT Corn’s minimal reliance on pesticide sprays.

20. Threats of GM crops
• Dominance of agribusiness
–GM crops require high capital inputs
–Large companies are more able.
–Small scale farmers unable to afford
the GM seeds and techniques.
–Small scale farmers cannot enjoy the
benefits.

21. Potential Health Risks
• Unknown effects on human health as
a result of genetic engineering.
• Concern over triggers of allergic
reactions due to the change in the
genetic composition of the crops.

22. Loss of biodiversity
• Success of GM crops harm other organisms.
• Transfer of pest resistance to wild varieties
lead to extinction of insects and animals that
feed on wild species.
• Monarch butterfly caterpillars die from eating
milkweed that were contaminated with pollen
from BT corn.

23. Causes of food shortages
• Physical factors
– Extreme Weather conditions, Climate change, Pests
• Political factors
– Civil strife, Poor governance
• Economic factors
– Demand from emerging economies, food policy, rising
costs
• Social factors
– Lack of accessibility, Bad logistics and distribution,
Population explosion.

24. Physical
Factors

25. Climate Change
• Change in weather patterns and global
climate affect growing season and crop
yield.
• Previously arable areas no longer
suitable.
• Loss of glacial ice reduces freshwater
supply for river basins globally.
–Agricultural land dependent on these will
dry up.

26. Extreme weather events
• Droughts, cold waves, heat waves,
tropical cyclones.
• Lead to destruction of crops, farmland
and potential food shortage.
• Extreme weather events more common
due to climate change.

27. Pests
• Rising global temperatures encourage
growth of pests.
• Swarms of pests increase to larger
quantities.
• Locusts swarms and Caterpillar invasions.

28. Political
Factors

29. Civil Strife
• Country faces major internal conflicts.
• Riots, unrest, or civil war.
• Disputes over control of resources.
• Reduction of food production.
– Farmland loss to war and conflict are unable to
contribute to production.

30. Poor Governance
• Corruption, policy errors and inability
to implement policy causes food
shortages.
• Prioritising other developmental
needs over ensuring food security
leads to re-allocation of farm land to
other functions.

31. Economic
Factors

32. Demands from emerging economies
• Rise of large LDCs (Brazil, Russia, India and
China BRIC).
• Increase in size and affluence leads to increase
in demand for food products.
• Larger demand leads to food shortages in
poorer countries.

33. Food Policy
• Governments use stockpiles to
ensure food security.
• However stockpiling may lead to
price rises.
• Reduction in global supply lead to
shortage for LDCs.

34. Food subsidies
• Money paid or tax deductions to make food
affordable.
• Countries with substantial economic reserves
able to use it to help citizens.
• Countries who are not rich enough to provide
subsidies will have large populations facing
food shortage.

35. Spike in fertiliser and transport costs
• Sudden rises in production costs lead to price
spikes of food.
• Without corresponding rise in income lead to
poverty and food shortages.

36. Loss of farmland
• Growing industrial crops leading to loss of
food crops
• Switch to biofuels lead to increase demand for
land for biofuel crops.
• Higher price of biofuel crops trigger shift from
food crop to biofuel crops.

37. Social
Factors

38. Lack of accessibility
• Lack of transport facilities hinder accessibility
to food.
• Location and quantity of food outlets also
affect the accessibility of food.
• Inability to access fresh produce leads to a
smaller food intake.

39. Food distribution
• The movement of food from farm to retail
outlets.
• Dependent on good transport network.
• Physical barriers and natural disasters can
disrupt distribution patterns and reduce the
food supply.

40. Rapid population growth
• Population growth is exponential
• Food production increment is unable to catch
up without technological advances.
• Larger population leads to further need for
land and reduction in existing farmland.
• Sub-Saharan Africa is at highest risk.

41. Is technology in food production the
solution?
• Current global food production exceeds global
needs.
• Many areas are still suffering from shortages.
• Technology is one part of the solution, other
factors need to be managed.

42. Summary
• People in DC and LDCs have different levels
and types of food consumption patterns.
• Food consumption patterns are influenced by
economic, socio-cultural and political factors.
• Inadequate food consumption leads to
malnutrition and starvation.
• Excess food consumption and choice of diet
may lead to obesity, lower productivity, food
wastage and dieting.