Warmup Which alternative energy source has the most

Warmup �Which alternative energy source has the most potential for North Carolina? �Which source comes in second?

Warmup �If a population has unlimited resources, it may experience this kind of growth… �What kind of growth is experienced by the world human population? �Draw the three kinds of demographic agestructure diagrams and describe the growth expected.

Sustainable Agriculture 2. 8. 2 a Critique the advantages and disadvantages of traditional agriculture/aquaculture techniques and compare with sustainable agriculture/aquaculture techniques. Include the economics and environmental impacts in this comparison. 2. 8. 2 b Judge potential impacts of sustainable techniques on environmental quality (include magnitude, duration, frequency).

Traditional Agriculture � Pros • Less time • Don’t have to pay as many workers • May get more of one crop � Cons • Typically only grow one crop ( • • monoculture) Often uses slash and burn Deplete soil nutrients (Need to farm somewhere else after a season or two) Possible pollution from use of chemical pesticides and fertilizers Need to constantly buy chemicals and seeds

Sustainable Agriculture � Pros • Natural, continually replenishing nutrients in the soil • Extends the “life of the land” • Don’t need to buy chemical pesticides and fertilizers � Cons • Takes time and attention to crops to be proactive about problems • Hard to do on a large scale (Note: This is just a test plot)

Sustainable Agriculture �Common • • • Practices Aquaculture Intercropping Crop rotation Companion Planting Trap crops

Aquaculture �Farming aquatic species, commonly salmon, shrimp, tilapia, oysters. �Pros: • Protein source can be grown in areas with poor soil (NEED clay soil) • If Sustainable: Integrated systems can be used �Barnacles growing on the nets filter fish waste and can be scraped off and fed to the fish �Fish can be farmed in rice tanks: fish fertilize rice and both can be harvested

Aquaculture �Marine or open water aquaculture has its risks if not sustainable. �Cons: -------->>

Crop Rotation �The practice of rotating use of different fields from crop to crop each year, to avoid exhausting the soil. �Applies to plants and animals (cows, etc) �Pros • Nitrogen fixation (beans) replenish soil nutrients • Different types of crops use different nutrients �Cons • Need to replant, change layout

Intercropping �The practice of growing two or more different crops at the same time on a plot. • ex/ a carbohydrate-rich grain that depletes soil nitrogen and a protein-rich legume that adds nitrogen to the soil • Pro: �Use space more efficiently �Grow a greater variety of crops �No need to rotate crops • Con: �Harder to harvest on a large scale

Companion Planting � The practice of planting specific plant together to help deter insects or to attract insects away from crops of interest � Pros • Plants do the work (“fertilize” each other) � Cons • Need to know what crops grow well together and which ones to avoid

Trap Crop �A plant that attracts agricultural pests, usually insects, away from nearby crops �Pros: • Insects won’t get to main crop �Cons: • Need to take time and space to plant a crop you won’t harvest

Video: Planting Hope �Peace Corps Volunteer from Panama started a NGO (Non. Government Organization) called Sustainable Harvest International (Cosecha Sustenible) �Subtitles � Need 10 facts

Activity: Create an Ad �Create an eye-catching, interesting, and creative ad promoting one of the sustainable agriculture techniques. �Poster should include: • Name of technique • How it’s done • Why it’s beneficial �Poster should NOT just be a list of facts. BE CREATIVE!