insert picture of lake from 1st page of ch Chapter 1 Studying the State of Our Earth
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1 insert picture of lake from 1st page of ch Chapter 1 Studying the State of Our Earth
2 I. The Mysterious Neuse River Fish Killer A over a few days time, a billion fish died in North Carolina s Neuse River B. the cause was identified as a microscopic free-living aquatic organism (Pfiesteria) in the river water which emitted a potent toxin that rapidly kills fish C. after lots of research, it was found that this species of organism could have 24 different life stages depending on the environmental conditions D. under most conditions Pfiesteria is harmless and fed on algae, but in the presence of high concentrations of nutrients and large populations of fish, it became carnivorous and burrowed into fish to feed E. Where did the nutrients come from? From humans along the river hog farms, agricultural fields, suburban areas all with fertilizer runoff and nutrient-rich waste to the river water F. Led to millions of dollars in loss G. Shows us how human activities can affect the environment in complex and unexpected ways also shows that environmental science can be controversial
3 II. Environmental Science Offers Important Insights Into Our World and how We Influence It A. Environment- a sum of all the conditions surrounding us that influence life. B. Environmental science- the field that looks at interactions among humans and nature. C. System- a set of interacting components that influence one another by exchanging energy or materials. D. Ecosystem- the living and non-living components of a particular place on earth.
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5 E. Biotic- the living part of the Earth (animals, plants) F. Abiotic- the non-living part of the Earth (soil, air, water) G. Environmental studies- includes environmental science, the study of interactions among human systems and those found in nature along with other subjects such as environmental policy, economics, literature and ethics.
6 Housing Developments are one way in which humans convert land from its natural state.
7 III. Humans Alter Natural Systems A. Humans manipulate their environment more than any other species.
8 Top Right: 1880 fewer than 6,000 people lived in LA Below Right: million people lived in LA
9 IV. Environmental Scientists Monitor Natural Systems for Signs of Stress A. Ecosystem services- environments provide life supporting services such as clean water, timber, fisheries, crops. B. Sustainability- living on the Earth in a way that allows us to use its resources without depriving future generations of those resources.
10 C. Environmental indicators help us describe the current state of an environmental system. The five global environmental indicators are: Biological diversity Food production Average global surface temperature and carbon dioxide concentrations in the atmosphere Human population Resource depletion
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12 D. Biodiversity- the diversity of life formed in an environment - Biological diversity includes genetic, species and ecosystem diversity. E. Genetic Diversity - A measure of the genetic variation among individuals in a population. Populations with high genetic diversity are better able to respond to environmental change than populations with lower genetic diversity.
13 F. Species Diversity - The number of species in a region or in a particular type of habitat. G. Species- a group of organisms that is distinct form other groups in form, behavior or biochemical properties. Individuals in a species can breed and produce fertile offspring. H. speciation evolution of a new species usually happens slowly about 1-3 new species per year worldwide I. background extinction rate average rate at which species go extinct over the long term also very slow about 1 species out of every million every year
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15 J. Ecosystem Diversity - A measure of the diversity of ecosystems or habitats that exist in a particular region. K. Food Production - Our ability to grow food to nourish the human population. We use science and technology to increase the amount of food we can produce on a given area of land.
16 World Grain Production per Person has increased since the 1950 s, but has begun to level off.
17 V. Average Global Surface Temperatures and Carbon Dioxide Concentrations A. Greenhouse gases- gases in our planets atmosphere that act like a blanket, trapping heat near Earth's surface. B. The most important greenhouse gas is carbon dioxide. C. Anthropogenic- caused by human activities.
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19 VI. Human Population A. The current human population is 7.1 billion. B. Over a million additional people is added to the Earth every 5 days. C.
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21 VII. Resource Depletion A. As the human population grows, the resources necessary for our survival become increasingly depleted. B. Some natural resources such as coal, oil and uranium are finite and cannot be renewed or reused. C. Other natural resources like aluminum or copper, also exist in finite amounts but can be recycled.
22 D. Development- improvement in human well-being through economic advancement. As economies develop, resource consumption also increases. E. Resource Use in Developed and Developing countries only 20% of the world s population lives in developed countries, but that 20% uses most of the world s resources the remaining 80% of the population lives in developing countries and uses far fewer resources per capita (see next page)
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24 VIII. Human Well-Being Depends on Sustainable Practices A. Sustainable Development- development that balances current human well-being and economic advancement with resource management for the benefit of future generations. B. In order to live sustainably: 1. Environmental systems must not be damaged beyond their ability to recover. 2. Renewable resources must not be depleted faster than they can regenerate. 3. Nonrenewable resources must be used sparingly.
25 Easter Island in the South Pacific provides a cautionary tale was once covered with trees and grasses but when humans settled the island, they multiplied quickly, cut down trees to build homes and canoes, and overused the island s soil and water resources by 1870 s, the trees were gone and the soil was eroded this unsustainable use of the natural resources appears to be the primary cause for the collapse of its civilization
26 Living Sustainably Sustainable choices such as bicycling to work or school can help protect the environment and conserve resources for future generations.
27 C. Defining Human Needs: 1. People in developed nations might say that they "need" electricity. 2. People in the developing world have never heard of this modern convenience. 3. Basic human needs- air, water, food and shelter.
28 D. The Ecological Footprint - A measure of how much a person consumes, expressed in area of land.
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31 IX. Science is a Process - The Scientific Method Observations and questions Hypothesis Collecting data Interpreting results Disseminating findings
32 A. Observations and Questions - Observing and questioning is the first step of the scientific process. B. Hypothesis - An educated guess that can be proved or disproved through controlled experimentation. 1. A null hypothesis is a statement that can be proved wrong.
33 C. Collecting Data: 1. Replication- repeating the measurement many times 2. Sample size- the number of times the measurement is repeated. 3. Accuracy- how close a measured value is to the actual or true value. 4. Precision- how close to one another the repeated measurements are. 5. Uncertainty- how much the measure differs from the true value.
34 D. Interpreting Results - Once results have been obtained, analysis of the data begins. This process involves two types of reasoning, inductive and deductive. 1. Inductive reasoning- the process of making general statements from specific facts or examples. 2. Deductive reasoning- the process of applying a general statement to specific facts or situations.
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36 E. Disseminating Findings - Scientists present papers at conferences and publish the results of their investigations. This allows other scientists to repeat the original experiment and verify or challenge the results.
37 F. Theory- a hypothesis that has been repeatedly tested and confirmed by multiple groups of researchers and is widely accepted. G. Natural law- When a theory has been tested multiple times and there are no known exceptions. Ex. Law of gravity and laws of thermodynamics.
38 X. Controlled Experiments and Natural Experiments A. Controlled experiment- an experiment conducted in the controlled conditions of a laboratory.
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40 B. Natural experiments- when a natural event, such as a volcano, acts as an experimental treatment in an ecosystem.
41 Mt. St. Helens
42 XI. Experimental Science Presents Unique Challenges A. There is no "control" planet to compare the Earth with. B. It is difficult to decide what is better or worse for the environment than something else. C. Environmental science has so many interacting parts, it is not easy to apply one system to another. D. Human well-being is a concern because people that are unable to meet their basic needs are less likely to be interested in saving the environment.
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insert picture of lake from 1st page of ch Chapter 1 Studying the State of Our Earth
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