unit one: introduction to environmental science · pdf filetheir causes and sustainability...
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Unit One: Introduction to Environmental Science
PPT 1: Environmental Problems, their causes and Sustainability Unit 1; PPT 1 Overview
• This unit presents an overview of environmental problems, their causes, and a review of scientific processes of Earth science, chemistry,physics, and biology.
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Why study Environmental Science? To learn…
…how nature works.
…how the environment affects us and how we affect the environment.
…how humans can live sustainably on Earth.
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Major components and interactions within and between the earth’s life-support system and the human sociocultural system. The goal of environmental science is to learn as much as possible about these complex interactions.
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An Environmental Issue (or problem) is a …..
• Known process (such as resource consumption) that has negative effects on the sustainability of the environmental quality necessary for the well being of the organisms living in it.
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What is Sustainability?
• The ability of Earth’s various systems to survive and adapt to changing environmental conditions indefinitely.
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What keeps the World Alive?
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Nature’s Survival Strategies Follow Three Principles of Sustainability
1. Reliance on solar energy
– The sun provides warmth and fuels photosynthesis
2. Biodiversity
– Astounding variety and adaptability of natural systems and species
3. BiogeoChemical cycling
– Circulation of chemicals from the environment to organisms and then back to the environment
– Also called nutrient cycling
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Solar Energy
Chemical Cycling Biodiversity Fig. 1-3, p. 8
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What is a resource?
• A resource is anything obtained from the environment to meet human needs and wants.
• Examples are food, water, shelter, manufactured goods, transportation, communication, and recreation.
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Classification of Resources
• Perpetual: On a human time scale are continuous. (Solar & wind)
• Renewable: On a human time scale can be replenished rapidly; hours to several decades. ( forests, fresh water, soil )
• Nonrenewable: On a human time scale are in fixed supply. ( fossil fuels)
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Renewable resources: forests, grasslands, wild animals, fresh water, fresh air, and fertile soil.
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Nonrenewable Resources
Ex: fossil fuels, metallic minerals, non-metallic minerals
• Exist as fixed quantity
• Becomes economically depleted.
• Recycling and reusing extends supply
• Recycling processes waste material into new material.
• Reuse is using a resource over again in the same form.
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Depletion of nonrenewable resources
SOLAR
CAPITAL
Human Capital Human
Economic
and
Cultural
Systems
Pollution and waste
Degradation of renewable resources
Heat
Goods and services
Natural Capital
EARTH
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Team Activity: Environmental Issues
• As a team, List environmental issues facing the world today….5 minutes…GO!
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Key Environmental Problems
• Habitat destruction and degradation
• Depletion of renewable and non-renewable resources
• Pollution
• Climate change
• Loss of species biodiversity
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The 5 Root Causes of Environmental Problems
• Human population growth
• Unsustainable use of resources
• Poverty
• Poor environmental accounting ( not including
the environmental costs of economic goods and services in their market prices. )
• Lack of environmental education ( trying to
manage and simplify nature with too little knowledge about how it works. )