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Unformatted text preview: Global Warming The SUN ~30% of total solar energy that hits the Earth's surface is reflected back ~70% absorbed by land, air, & oceans Not all is bound to Earth Emitted back into space via thermal radiation Some of this is re-absorbed in atmosphere & reradiated back to Earths surface Keeps life on Earth at a reasonable temperature Solar energy = life on earth Global Warming Artificial rise in greenhouse gasses factories, power plants, cars, trash decomposition, cattle raising, N-based fertilizers Trap excess heat Earth's surface temp has increased by 0.4 0.8C over past 100 yrs Sea level risen by 0.1-0.2 meters in last 50 yrs Recession of world's glaciers Climate Potential Effects of Global Warming 1. 2. 3. 3 Views on Climate
Will have little impact on day-to-day weather Changes will be subtle like getting old Temp will reach a threshold & trigger drastic changes Mid to high latitude regions will rise the most in temp Precipitation increasing in some regions & decreasing in others More destructive weather patterns: storms, hurricanes Rising sea levels: 0.09 0.88 meters d/t seawater expansion Effects of climate change on habitats & agriculture Effects on impoverished nations What does the future hold? Depends on how human industry & expansion will impact Earth 16 scenarios as to mankind's future is concerned by looking at population growth "Business as Usual" worst case scenario continued population growth & use of more fossil fuels Best case scenario environmentally friendly technology & population increase halted Sustainable Farming Definition Sustinare (Latin to keep in existence or maintain, implies long-term support/permanence) Sus from below Tenere to hold Ultimately seeks to sustain farmers, resources & communities by promoting farming practices & methods that are profitable, environmentally sound & good for communities U.S. Congress: 1990 Farm Bill Sustainable agriculture is an integrated system of plant & animal production practices having a sitespecific application that will
1. 2. 3. 4. 5. Satisfy human food & fiber needs Enhance environmental quality & natural resources Make the most efficient use of nonrenewable resources & on-farm resources Sustain economic viability of farm operations Enhance quality of life for farmers & society as a whole Why is this important? Looking back at history there was a connection between agriculture and the food at one's table Do you know where your lunch came from or how far it traveled? Sustainable dining promotes buying seasonal produce & food products from local farmers & purveyors Increase in childhood obesity and decrease in family farms Applying sustainable dining at the dinner table and at school Farm to School Programs Bids & buying "American" in federal nutrition program USDA & increase in commodity rate DOD & fresh produce program Olympia School District No dessert! Buy organic Madison Metropolitan School District Grants What will the Kids Think? Initial resistance Small, whole fruit without blemishes Vegetables with dip Enriched curriculum Field trips & school gardens Curiosity & knowledge leads to eating Decrease in waste Farm to College Programs Fast food chains & processed food Need & demand for more healthy meal options Philosophy into action & peaks awareness Yale & the Sustainable Food Project Middlebury College & an Environmental Center Stanford moving cautiously To sum it up... Sustainable agriculture is: Economically viable Socially supportive Ecologically sound Organic Farming USDA National Organic Program
NO: antibiotics (for prevention) or growth hormones genetically-modified organisms irradiation, synthetic pesticides petroleum-based or sewage sludge-based fertilizers animal feed that contains manure or parts of slaughtered animals, plastic pellets, urea Animals must have outdoor access and freedom of movement Farming should minimize erosion and runoff Certification Process Certification agencies registered with the gov't Fields must be organic for 3 years before they can be labeled and sold as such Annual inspections Must document all soil inputs in fields Farmers must develop soil fertility and pest control plans Buffer zone between them and conventional farms "100% Organic" only organic ingredients "Organic" 95% organic ingredients "Made with organic ingredients" 70% organic Why does organic food cost more? Not a mass-market item Its picked ripe, so shorter shelf-life Environmentally-friendly practices are more labor intensive Methods used are not subsidized by taxpayers Therefore, consumers are paying the full cost of growing the food ...
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This note was uploaded on 09/08/2010 for the course NUFS 139 at San Jose State University .