how can all of the people in the world be fed?
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How can all of the people in the world be fed?. Food Distribution Problems. War. Famine often accompanies war or involves criminality (clip: YouTube - Somalia Behind the Headlines Somalia ) YouTube - 8 minute crash course about Somalia YouTube - Black Hawk Down - Trailer - PowerPoint PPT PresentationTRANSCRIPT
WarFamine often accompanies war or involves criminality (clip: YouTube - Somalia Behind the Headlines Somalia) YouTube - 8 minute crash course about SomaliaYouTube - Black Hawk Down - Trailer
Not able to plant crops – too dangerousRelief resources only available during ceasefiresSometimes the resources are taken by the government or military powers to feed the soldiers rather than the civilians
DebtMany countries owe the IMF or World Bank and therefore sanctions are imposed on their countriesForced to grow “cash crops” for profit – coffee, cotton, tea, sugar cane, peanutsLess land for subsistence food crops Means cutting spending on health, education, and housing leading to greater poverty and the cycle continues
Technology
Green RevolutionSuper seeds require more water, fertilizer and pesticidesPoor countries can’t afford to grow foodContaminates waterGenetically modified foods
Natural Causes
Not as large a factor as the 3 mentioned aboveDroughtPoor soil qualityFloodingClimate
The Green RevolutionThe introduction and rapid spread of high yield wheat and rice. First large use of chemical pesticides and high yield varieties of crops
Achieved by crossing of the different strains of major food crops to greater and larger yields that were more resistance to drought and disease. When: mid 1960’sPurpose: To meet the food needs of the developing world.
The Results….led to greater grain and rice productionhigher food outputs for LDC’sHelped stave off catastrophic famines!Self-sufficiency for some countries (Pakistan-wheat exporter, India-11 m tonnes to 27 m tons from 1965 to 1972, Mexico- double wheat yields, Philippines and Indonesia-rice previously imported)Planting dates become more flexible
Rich farmers have the resources for fertilizer, pesticides, irrigation water, machinery, storage and transportation (gap between rich and poor farmers widen)Colour, texture and tastes of new rice not well received.More difficult to raise output of rice with biotechnology due to precise water control. high yield varieties more costly to produce Many HYVs require more labour than the traditional counterparts (irrigation and fertilization)Contamination of watersheds by nitrates and phosphates, long term destroyed soilLoss of biodiversity-4 strains of wheat produce 3/4 of Canada’s crop.If farmers only rely on a few strains of a plant, a new disease can wipe out a large portion of the harvest
Criticisms of the Green Revolution
FACT
Some African countries import wheat due to the trend to consume “western foods”. Also, it is cheaper because governments have kept down the price of imported cereals. Thus, local farmers produce CASH CROPS for export rather than food crops for local consumption.
Solutions…Maintain genetic Banks where seeds from a great diversity of plants can be frozen and stored.Control populationGenetically modified foods (GM) Get from the Sea…
The Blue Revolution
The Blue RevolutionModern technology has allowed us to obtain food from the sea in many fish varietiesincreased seventeen fold in the last fifty yearsAquaculture, or the growing or harvesting of marine plants and animals for human consumption, is predicted to overtake the traditional wild fishery
What it can do…
Protein source for the one billion chronically malnourished people worldwideRelieve pressure on land
ConcernsExploitation of the traditional wild fisheryBoundary disputesAquaculture destroys land along coastsWater pollutionWetland lossSpread of disease
What About the TermsGenetic Engineering/Genetically Modified?
Genetic engineering involves:
Isolating genes Modifying genes so they function better Preparing genes to be inserted into a new species Developing transgenes
Genetic engineering is the basic tool set of biotechnology
What is a transgenic?
Transgene – the genetically engineered gene added to a species
Ex. – modified EPSP synthase gene (encodes a protein that functions even when plant is treated with Roundup)
Transgenic – an organism containing a transgene introduced by technological (not breeding) methods
Ex. – Roundup Ready Crops (owned by Monsanto, as seen in “Food Inc”)
Concept Based on the Term Transgene
We can develop organisms that express a “novel” trait not normally found in the species
Why are transgenics important?
Extended shelf-life tomato (Flavr-Savr)
Herbicide resistant soybean (Roundup Ready)
Agriculture Transgenics On the Market
Source: USDA
Insect resistant cotton – Bt toxin kills the cotton boll worm• transgene = Bt protein
Insect resistant corn – Bt toxin kills the European corn borer• transgene = Bt protein
Normal Transgenic
Virus resistance - papya resistant to papaya ringspot virus
Source: Monsanto
Herbicide resistant crops Now: soybean, corn, canola Coming: sugarbeet, lettuce, strawberry alfalfa, potato, wheat
Biotech chymosin; the enzyme used to curdle milk products
bST; bovin somatotropin; used to increasemilk production (remember “Food Inc”WAl-MART STOPPED Bst Milk)
Source: Rent Mother Nature
Source: Chr. Hansen
Some Ag Biotech Products Are Discontinued
Poor Quality• FlavrSavr tomatoes (Calgene)
Negative Consumer Response• Tomato paste (Zeneca)
Negative Corporate Response• NewLeaf (Monsanto)
Universal Negative Publicity• StarLink corn (Aventis)
Why???
Next Generation of Ag Biotech Products
Source: Minnesota Microscopy Society
Golden Rice – increased Vitamin A content by adding carotene (effort to fight childhood blindnessbut not without controversy)
Sunflower – white mold resistance
Turfgrass – herbicide resistance; slower growing (= reduced mowing)
Bio Steel – spider silk expressed in goats; used to make soft-body bullet proof vests (Nexia)
Human Applications
• Pharmaceutical products New solutions to old problems • Disease diagnosis Determine what disease you have or may get
• Gene therapy Correcting disease by introducing a corrective gene
Biotechnology and Health
Product Use
Insulin Diabetes
Interferon Cancer
Interleukin Cancer
Human growth hormone
Dwarfism
Neuroactive proteins Pain
The genes for these proteins are:
• Cloned• Inserted into bacteria
Environmental Applications
Bioremediation - cleanup contaminated sites; uses microbes designed to degrade the pollution
Indicator bacteria – contamination can be detected in the environment
Tooth decay – engineered Streptococcus mutans, the bacteria that destroys enamel
Future Health-related Biotech Products
Vaccines – herpes, hepatitis C, AIDS, malaria
Edible VaccinesTransgenic Plants Serving Human Health Needs
• Works like any vaccine • A transgenic plant with a pathogen protein gene is developed• Potato, banana, and tomato are targets• Humans eat the plant • The body produces antibodies against pathogen protein• Humans are “immunized” against the pathogen• Examples:
DiarrheaHepatitis BMeasles
A Popular Term We Need To Know
GMOs - Genetically modified organisms
• GMO - an organism that expresses traits that result from the introduction of foreign DNA
• Originally a term equivalent to transgenic organism•Also called GMFs or “Frankenfoods”
Some claim any improved biological product is a GMO
They feel this will
For example, some call plant varieties biotechnology products
This is a false claim
The GMO Ruse
• ease the publics fear• pave the way for product acceptance
Let’s Be Up Front
• Biotechnology adds traits not available in the species
Soybean does not have a gene to breakdown Roundup The gene comes from bacteria
• Breeding Biotechnology
Breeding only exchanges genes found in the species Breeding can transfer the transgene to other breeding materials BUT this does not make it a biotechnology procedure
Important Plant Improvement Methods
• Breeding Crossing two individuals from the same species; produces a new, improved variety; not a biotechnology procedure
• Transformation Adding a gene from another species; the essential biotechnology procedure to produce transgenics
Source: USDA
Source: USDA
The Roundup Ready Story
• Glyphosate is a broad-spectrum herbicide• Active ingredient in Roundup herbicide • Kills all plants it come in contact with• Inhibits a key enzyme (EPSP synthase) in an amino acid pathway
• Plants die because they lack the key amino acids
• A resistant EPSP synthase gene allows crops to survive spraying
The Golden Rice Story
• Vitamin A deficiency is a major health problem
• Causes blindness• Influences severity of diarrhea, measles
• >100 million children suffer from the problem
• For many countries, the infrastructure doesn’t existto deliver vitamin pills
• Improved vitamin A content in widely consumed cropsan attractive alternative
-Carotene Pathway Problem in Plants
IPP
Geranylgeranyl diphosphate
Phytoene
Lycopene
-carotene(vitamin A precursor)
Phytoene synthase
Phytoene desaturase
Lycopene-beta-cyclase
ξ-carotene desaturase
Problem:Rice lacks
these enzymes
NormalVitamin A
“Deficient”Rice
The Golden Rice Solution
IPP
Geranylgeranyl diphosphate
Phytoene
Lycopene
-carotene(vitamin A precursor)
Phytoene synthase
Phytoene desaturase
Lycopene-beta-cyclase
ξ-carotene desaturase
Daffodil gene
Single bacterial gene;performs both functions
Daffodil gene
-Carotene Pathway Genes Added
Vitamin APathway
is completeand functional
GoldenRice
Desertification….What is It?
Land degradation in arid, semi arid and dry sub-humid areas due to:
Over cultivationOvergrazingDeforestation Poor irrigation practices
Drought - Irregular precipitation Populations in these areas used the methods of shifting agriculture and nomadic herding to respond to these challenges but…changing economic and political circumstances, population growth, and a trend towards more settled communities has increased desertification
Problems with Desertification
The Earth's drylands are found in more than 110 nations, and moderate to severe land degradation has reduced the productivity of more than 70% of these areas..
Consequences…reduces the land’s resilience to natural climate variability.Soil becomes less productiveVegetation becomes damaged or lostSome of the consequences are borne by people living outside the immediately affected areaFood production is underminedDesertification contributes to famineDesertification is a huge drain on economic resources
Africa and Desertification2/3 of the continent is desert or drylands.
affected by frequent and severe droughts.Many African nations are landlocked, have widespread poverty, need external assistance and depend heavily on natural resources for subsistence
few institutional, legal, scientific, technical and educational resources
linked to migration and food security-Sahel zone (southern border of the Sahara Desert )
What about North America?
90% of arid land impacted
overstocking (livestock)- contributes to erosion and desertification. excessive withdrawals of groundwater - resulting in a rapid decline in height of the water table. salinization – from salts left behind on the soil surface after the irrigation water has evaporated.