Political Science 2137 Lecture Notes - Newsprint, Global Issue, Pharmacopoeia
9 Nov 2011
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Document Summary
Politics of the environment: trees and the ecosystem. -green plants are the producers of life in the ecosystem: transferring energy through photosynthesis from physical to biological parts of the system; oxygen is produced; our atmosphere was created by green plants. -trees are a source of food, shelter and many other products. -trees release water through transpiration (1 tree puts out 000"s of gallons water in a day) -since 8000 bc billions of acres of forest and woodland have been lost to agriculture: temperate: trees which survive in a seasonal climate. -have evolved to survive in changing conditions; hardy resilient; -97% of the nutrients necessary for new growth are in the soil. -in canada: we have 10 major climate zones with a vast number of species. -128 broad/narrow leaf coniferous (evergreen) species: tropical: trees which survive in a relatively constant climate. -less history of being under siege from harvesting.
