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Biology 2485B - Lec 14.docx

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Department
Biology
Course
Biology 2485B
Professor
Ben Rubin
Semester
Winter

Description
Lec 14 Mar 4, 2014 Canadas energy stream • Canada is a net exporter • Two main sources of domestic energy are oil and natural gas • Net are Hydro, coal and uranium Coal formation • Boreal, peat, wetlands, bogs, etc • Peatlands  ▯increasing temp, pressure and time yields coal types • Peat is partially decomposed organic matter from plants  o Boreal regions are cold, and decomposition is very slow o Coal sulfur composition can differ – soft coal has more sulfur  China – 3%  NS – 2%; BC – 0.5%  Energy return on investment • It takes energy to make energy • EROI = energy returned/energy invested • Net energy = energy returned – invested o Ecologically retrievable if EROI greater than one (>1) o Ecological threshold ­ Need more energy outputted than inputted o Economic threshold – with tech you have, be able to retrieve it for less  than it is being sold for Subsurface mining • Accidents – gas inhaled, explosive • Disease – black lung disease • Cost – trade off between cost and safety • Many killed by coal which the cost Surface mining • Coal is buried beneath a layer of earth • Overburden – requires mountain top removal, habitat destruction • Coal <
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