Food processing presentation for bsc agriculture hons
Humans Nature Overview Environmental Science Human Health
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2. What is environmental science? A useful definition is simply …the study of Earth’s various environments including the biosphere, lithosphere, hydrosphere and atmosphere. It should emphasize knowledge and awareness of: • major environmental problems in the United States and the world; • factors relating to human interaction with the environment; • human-environmental interaction, global habitability and environmental change, and sustainable human societies.
3. Environmental Science Animal and vegetable life is too complicated a problem for human intelligence to solve, and we can never know how wide a circle of disturbance we produce in the harmonies of nature when we throw the smallest pebble into the ocean of organic life. ~ George Perkins Marsh
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5. Diagram makes it clear that environmental science is multidisciplinary and interdisciplinary. That is, “it takes all kinds” of observations and inputs to “do” environmental science. If you really got a hold of anything in the Universe, you find out that it’s hitched to everything else .—John Muir, Founder, Sierra Club
15. Aquatic and marine resources—long-neglected, over-exploited, directly and indirectly* impacted. *remember, water flows downhill—The 1 st Law of Ecology
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18. 3. Life “pollutes” CH 3 COOH -->CH 4 +CO 2 CO 2 + H 2 O --> CH 2 O + O 2 CH 2 O + O 2 --> CO 2 + H 2 O
27. Living in an exponential age That was 1999, it’s 6.46 billion now The environmental problems we face – population growth, wasteful use of resources, destruction and degradation of wildlife habitats, extinction of plants and animals, poverty, and pollution – are interconnected and are growing exponentially.
44. “ For the first time in the history of the world, every human being is now being subjected to dangerous chemicals from the moment of conception to death.” ~Rachel Carson
45. Including the oft ignored…pathogens! Pathogens can: kill native species - humans spread new diseases and parasites to native species
46. Since our focus will be human health… Direct – STDs Indirect – Touching contaminated surfaces Droplet – Ears, nose or mouth Airborne – Influenza or pneumonia Fecal-oral – Digestive Vector-borne – (Flies, Rats, Mosquitoes) Pathogens invade new hosts in two ways. Most are transported by humans or animals (either on purpose or accidentally), but some make their own way (e.g., blown by a storm). Methods of transmission include: