ENV100H1 Quiz: ENV100 FULL MODULE ONE NOTES, ALL LECTURES FOR MOD1

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Published on 9 Jan 2018
School
UTSG
Department
School of Environment
Course
ENV100H1
Professor
ENV MOD ONE- ALL LECTURES
Environmental science explores interactions between humans and the physical and biological
world.
-encompasses the biochemical-physical system in which people and other organisms exist
-Dynamic interrelationships among organisms (including ppl) and their surroundings
(physical, chemical, biological, geological, social/cultural)
Environmental science is interdisciplinary
-Environmental issues are inherently interdisciplinary
-Our understanding is greater than a “sum of the parts”
What is science and how does it work?
-A systematic process for learning about the world and testing our understanding of it.
-The accumulated body of knowledge that arises from this dynamic process.
Scientists test ideas using critical analysis
-Scientific method: Testing ideas through observation, questioning, and experimentation
-Assumptions: The universe works according to natural laws. Events arise from causes,
and cause other events. We use logic, systematic testing, and our senses to understand
natural law.
Millennium Ecosystem Assessment Findings:
-Rapid, extensive changes in the past 50 years
-Substantial and irreversible loss in biodiversity
-Net gains in human development and economic well-being, but at a cost
-degradation likely to worsen
-Reversing the degradation of ecosystems will require significant changes.
How do we define sustainability:
-Meeting present needs without compromising the ability of future generations to meet
their needs – 1987 Brundtland Report
-Bearing in mind the effect of our actions on our descendants for seven generations-
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Iroquois Confederacy.
3-Legged sustainability Stool:
-Economic leg (Good jobs, fair wages, security, infrastructure, fait trade)
-Environmental leg (0 Pollution & waste, renewable energy, conservation, restoration)
-Social Leg (working conditions, health services, education services, community &
culture, social justice)
3 overlapping circles model:
-Sustainability lives between the overlap of society, environment and economy (3 circle
venn diagram)
3 nested- dependencies model
Conclusions:
-Environmental science helps us understand our relationship with the environment and
informs our attempts to solve and prevent problems.
-Observing and critically analyzing are the first step toward scientific understanding.
-the global community faces many challenging environmental problems.
- Environmental science can help us find balanced, sustainable solutions to environmental
problems.
What is a hypothesis:
- A provisional statement that proposes a possible explanation for a particular observed
phenomenon.
- Superstitions are primitive hypotheses.
Environmental Science:
-We propose and test hypotheses to understand pattern and relationships in nature, and to
understand the effects and consequences of human activities on the environment.
-Good hypotheses “Breed”. When tested, give rise to lots of other hypotheses.
What is a null hypothesis
-a statement of “no effect”
-Experimental results are analyzed to see whether they support the (alternate) hypothesis
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or the null.
Good study designs:
- Have adequate sample sizes
- Are unbiased
- Are achievable
- Have some kind of comparison (to a relevant control group, to previous conditions,
etc.)
- Are ethical
A good hypothesis is smart
- S= specific
- M= measurable
- A= Achievable
- R= Realistic
- T= Time-bound
What is a bad hypothesis:
- Unfalsifiable hypothesis
- Untestable hypothesis rlg 204
- “Out-there” hypothesis
- Correlation is not causation
Time scale of earths history
- Age of sun and solar system ~ 4.57 Ga
o Based on models of stellar evolution and dating of primitive solar system
objects
Carbonaceous Chondrites (meteorites)
- Age of earth ~ 4.54 Ga
o Based on ages of terrestrial rocks + age of solar system + models of solar
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Document Summary

Environmental science explores interactions between humans and the physical and biological world. Encompasses the biochemical-physical system in which people and other organisms exist. Dynamic interrelationships among organisms (including ppl) and their surroundings (physical, chemical, biological, geological, social/cultural) Our understanding is greater than a sum of the parts . A systematic process for learning about the world and testing our understanding of it. The accumulated body of knowledge that arises from this dynamic process. Scientific method: testing ideas through observation, questioning, and experimentation. Assumptions: the universe works according to natural laws. Events arise from causes, and cause other events. We use logic, systematic testing, and our senses to understand natural law. Rapid, extensive changes in the past 50 years. Net gains in human development and economic well-being, but at a cost. Reversing the degradation of ecosystems will require significant changes. Meeting present needs without compromising the ability of future generations to meet their needs 1987 brundtland report.

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