Introducing Environmental Science and Sustainability
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1 1 Introducing Environmental Science and Sustainability
2 Overview of Chapter 1 Human Impacts on The Environment Population, Resources and the Environment Sustainability Environmental Science Addressing Environmental Problems
3 The Environment (Earth) Life has existed on earth for 3.8 billion yrs Earth well suited for life Water over ¾ of planet Habitable temperature, moderate sunlight Atmosphere provides oxygen and carbon dioxide Soil with essential minerals for plants
4 Human Impacts on Environment- Population Earth s Human Population is at 6.9 billion Growing exponentially Expected to add several billion more people in 21 st century
5 Population 1 in 4 people live in extreme poverty Cannot meet basic need for food, clothing, shelter, health Difficult to meet population needs without exploiting earth s resources
6 Gap Between Rich and Poor Highly Developed Countries (HDC) Complex industrialized bases, low population growth, high per capita incomes Ex: US, Canada, Japan
7 Gap Between Rich and Poor Less Developed Countries (LDC) Low level of industrialization, very high fertility rate, high infant mortality rate, low per capita income Ex: Bangladesh, Mali, Ethiopia
8 Types of Natural Resources
9 Consumption Consumption Human use of materials and energy People in HDCs are big consumers Unsustainable Consumption Occurs when the level of demand on a country s resources damages or depletes the resource enough to reduce the quality of life for future generations Caused by overpopulation and/or overconsumption
10 Ecological Footprint The average amount of land, water and ocean required to provide that person with all the resources they consume Earth s Productive Land and Water Amount Each Person is Allotted (divide Productive Land & Water by Human Pop.) Current Global Ecological Footprint of each person 11.4 billion hectares 1.8 hectares 2.7 hectares
11 Ecological Footprint Humans have an ecological overshoot
12 Ecological Footprint Comparison
13 IPAT Model Measures 3 factors that affect environmental impact (I) Environmental Impact Affluence per person I = P A T Number of people Environmental effect of technologies
14 Environmental Sustainability
15 Environmental Sustainability The ability to meet current human need for natural resources without compromising the needs of future generations Requires understanding: The effects of our actions on the earth That earth s resources are not infinite
16 Tragedy of the Commons Garrett Hardin ( ) Solving Environmental Problems is result of struggle between: Short term welfare Long term environmental stability and societal welfare Common pool resources Garrett used Common Pastureland in medieval Europe to illustrate the struggle
17 Sustainable Development- Systems Concept Economic development that meets the needs of the present generation without compromising future generations
18 Environmental Science An interdisciplinary study of human relationship with other organisms and the earth Biology Ecology Geography Chemistry Geology Physics Economics Sociology Demography Politics
19 Earth System and Environmental Science System A set of components that interact and function as a whole Global Earth Systems Climate, atmosphere, land, coastal zones, ocean Ecosystem A natural system consisting of a community of organisms and its physical environment
20 Earth Systems and Environmental Science Negative feedback Change triggers a response that counteracts the changed condition
21 Feedback Positive feedback Change triggers a response that intensifies the changing condition
22 Scientific Method
23 Controls and Variables in Experiment Variable A factor that influences a process The variable may be altered in an experiment to see its effect on the outcome Control The variable is not altered Allows for comparison between the altered variable test and the unaltered variable test
24 Five Steps to Addressing An Environmental Problem Five steps are idealistic Case Study: Lake Washington
25 Assessing Environmental Problem Case Study: Lake Washington Large, freshwater pond Suburban sprawl in 1940 s 10 new sewage treatment plants dumped effluent into lake Effect = excessive cyanobacteria growth that killed off fish and aquatic life
26 Assessing Environmental Problem Case Study: Lake Washington Scientific Assessment Aquatic wildlife assessment done in 1933 was compared to the 1950 assessment Hypothesized treated sewage was introducing high nutrients causing growth of cyanobacteria Risk Analysis After analyzing many choices, chose new location (freshwater) and greater treatment for sewage to decrease nutrients in effluent
27 Assessing Environmental Problem Case Study: Lake Washington Public Education/Involvement Educated public on why changes were necessary Political Action Difficult to organize sewage disposal in so many municipalities Changes were not made until 1963! Evaluation Cyanobacteria slowly decreased until 1975 (gone)
28 Assessing Environmental Problem Case Study: Lake Washington Results
Introducing Environmental Science and Sustainability
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