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2. http://www.factoryfarming.com/environment.htm

3. http://www.oxfamamerica.org/whatwedo/where_we_work/united_states/news_publications/food_farm/art2565.html

4. http://www.agr.gc.ca/policy/environment/air_03_e.phtml

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15. http://en.wikipedia.org/wiki/Computer_vision