Environmental Science

1
Environmental Science

• Chapter 9
• Notes 1

2
Why people go hungry

• Terms
• Malnutrition getting enough calories, but not
  the proper nutrients
• Proper Nutrients include
• Proteins
• Carbohydrates
• Fats
• Vitamins and Minerals
• Famine widespread food shortage

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Why people go hungry

• Carbohydrates
• provide energy for the body
• Energy yield 4 Cal/gram
• Fats
• a form of energy your body can store for later
  use
• Energy yield 9 Cal/gram
• Proteins
• Builds structures and maintains the body
• Provides us with 8 essential amino acids
• Energy yield 4 Cal/gram

4
Why people go hungry

• Fun Math
• For Lunch Gunnar consumed 100 grams of protein,
  20 grams of fat, and 75 grams of carbohydrates
• How many total Calories?
• In this meal, what percentage of his meal is
  protein? fats? carbohydrates?

5
Why people go hungry

• Fun Math
• For Lunch Gunnar consumed 100 grams of protein,
  20 grams of fat, and 75 grams of carbohydrates
• If Gunnar cut his fat in half, how many fewer
  calories would he consume? New Caloric intake?

6
Why people go hungry

• Food Production (agricultural yields) has
  increased over the last 50 years
• Human population is also growing rapidly
• If we evenly split all the food made NO ONE
  would get the proper nutrients to remain healthy
• Bottom Line food production isnt increasing as
  quickly as the human population

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Why people go hungry

• Other causes of food shortages
• Drought
• Causes crop damage/failure
• Political issues
• Wars/disputes disrupt transportation and then
  food cant get to people that need it
• Political struggles one side can withhold food
  to get the other side to give up other items in
  order to get food back

8
Why people go hungry

• Green Revolution
• 1950s to 1970 in Asia and Latin America
• New gains introduced to produce higher yields
• Yields
• amount of crop produced per acre/hectare

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Why people go hungry

• Problems
• Grains needed fertilizer/pesticides/proper
  irrigation
• Very Expensive
• Subsistence farmers (crop production is limited
  to meeting the food needs of one family) could
  not afford to grow these grains

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Why people go hungry

• Current/Common Agricultural Ventures
• Livestock
• Chicken, cows, sheep, etc
• Meat/Dairy, leather goods, wool, manure, etc.
• Plants
• Corn, wheat, etc
• Wheat popular choice, used in many products,
  because it requires the least amount of energy to
  produce

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Why People go hungry

• Interesting Facts
• Developed countries have diets that are much
  higher in proteins and fats compared to
  developing countries
• The US is in the top ten Most Obese Nations
  (currently we are 1)
• Michigan is in the top 10 most obese states
  (currently 10 as of July 2011)

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Assignments

• Read Section 9.1 (before tomorrow)
• Complete the 9.1 worksheet