BBE 1001 Lecture Notes - Lecture 3: Crop Rotation, Polyculture, Soil Carbon
16 Dec 2017
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Document Summary
Many mined materials are low quality in ore. Most items are recycled but rarely to same product. Small percentage of oil goes to fuel. End of life: fuel goes into area (h2o and co), plastic waste, percentage is recycled - but more waste is generated each year. High outputs of co2 and other greenhouse gases and waste. End of life varies by material - high energy to recycle. Photosynthesis: co2 in air plus water becomes cellulose and releases o2. Stores solar energy = benefit to burning biomass. Burning wood reverses the equation of photosynthesis. Assuming wood is sustainable if planting as many as are harvested. Energy: minimal to harvest, stores co2 and solar power. Water: watershed, little to no water used in solid wood processing, but used a lot in paper processing. Outputs: producing as much co2 with rot as o2, minimal. End of life: problems when laminated with other materials. Require inputs: minerals, h2o, o2 (wood requires fewest)
