Human Impacts upon Earth
Historical Basis of Pollution
Pollution: Human released products in the
amounts and durations that cause adverse effects.
Two primary factors that affect damage done
Land Use Planning
1/3 to of world land mass has been changed by
Historical Land Use
Lands surface is typically considered a
Gaining area of one land use type requires the loss
of another type.
Parent Material subsoil topsoil
Parent material goes through process of
wind and water move small particles, exposing new
Agriculture and Pest Management
Slash and Burn Agriculture.
Small areas - usually in tropics
Burning returns nutrients to soil
polyculture practiced = plant many different types of plants
Land recovers - forest re-invades
The Water Issue
Cells in all living organisms are 60% water
Water has number of useful properties
Molecules stick together
Great ability to separate other molecules
Heats and cools slower than most substances
Can be used to dissolve trans
Power Plant Emissions
Chemical Plant Emissions
Human Sources can be controlled and prevented, natural
The Disposable Decades - 50s-90s
1. Disposable Life Style - Use once and throw away
2. Convenience became necessity
3. Results some areas are running out of landfill space
B. Scope of the Municipal Solid Waste Problem
1. We produce 220 mill
Hazardous and Toxic Materials in Our Environment
We are a chemical based society - by-products are often
toxic and hazardous wastes.
1. Benefits versus Costs (impacts on ecological and human
2. Examples of hazardous materials impa
Final Exam Review Questions
BIOL 1130.001 Dr. Thuesen 6-8:50pm M
1. Understand chemical fertilizers and how they are used.
2. What has substituted for labor in mechanized agriculture?
3. Understand the economics of pesticides.
4. Be able to differentiate
As demand increased, reliable sources were
Oil, coal and natural gas represent 90% of worlds
commercially traded energy.
nonrenewable energy source
Resource: useful to humans and can potentially be
Life and Societies require energy.
Sun provides all energy to maintain life.
First energy transfer during photosynthesis
In hunter-gatherer societies, only energy needed
was food (plant or plant supported energy).
BIOL 1130.001: INTRODUCTION TO ENVIRONMENTAL SCIENCE
Lecture Schedule Spring 2002
Dr. Kevin Thuesen
Phone (940) 565-2463
Lecture: Monday 6:00 pm to 8:50pm
Office Hours Monday 4:00pm 6:00pm in EESAT 320K
Views of Nature
Control nature, or we are wasting resources.
All living things have value.
Problems now arise because of rate, scale and
complexity of human interactions with the environment.
Management of earth for future generations may be
Where is your greatest
interaction with the
What should you know
about that interaction?
Decisions in life ruled by Risk and Cost
Take Hwy at 70 or side road at 35?
How likely will someone or something be
How much will it cost to prevent?
Probability versus Possibility
Facts and ass
Series of regular
Result in climax
Total lack of organisms and bare rock or water
Human Population Issues
World population growth is a contributing factor in nearly
all environmental problems
Projected to have 7.8 billion people by the year 2025.
Most of the increase will be in Africa, Asia and Latin
Population - a group of individuals of the same species
occupying an area and capable of interacting with each
Natality # of individuals added to population
birthrateborn per 1000 individuals pe
- trade, communication, technology, information as a
- During the past 20 years, the amount of energy and
natural resources used in the U.S. to produce each constant
dollar of output has declined, as has many forms of