Transcript Notes #1
Environmental Science Chapter 9 Notes #1 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 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 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? 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? 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 isn’t increasing as quickly as the human population Why people go hungry… Other causes of food shortages Drought Causes crop damage/failure Political issues Wars/disputes = disrupt transportation and then food can’t 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 Why people go hungry… “Green Revolution” 1950’s to 1970’ in Asia and Latin America New gains introduced to produce higher yields Yields amount of crop produced per acre/hectare Why people go hungry… Problems Grains needed fertilizer/pesticides/proper irrigation Very Expensive Subsistence farmers (crop production is limited to meeting the food need’s of one family) could not afford to grow these grains 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 Why People go hungry Interesting Developed Facts: 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) Assignments Read Section 9.1 (before tomorrow) Complete the 9.1 worksheet