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Side ASide B
biological science that studies organisms (living things)
group of organisms with distinctive traits
set of organisms interacting w/ one another and w/ either environ. w/in defined area
ability of the earth's natural systems & human cultural systems & economies to survive and adapt
natural resources/services that keep life alive/support our econs.
functions of nature which support life and human economies
circulation of chems. necessary for life from environ. thru organisms back to environ.
energy from sun
environmentally sustainable society
one that meets current/future bsaic resource needs in a just manner w/o compromising future gens. to meet their basic needs
renewable resources provides by natural capital
gross domestic product (GDP)
annual market value of all goods/services produced by all firms/orgs.
per capita GDP
GDP divided by total pop. at midyear
per capita GDP PPP
measure of amount of goods/services a country's average citizen could by in U.S.
goal of using economic growth to improve living standards
1.2 billion people (U.S., Canada, Japan, Europe)
5.5 billion people (Africa, Asia, Latin America)
anything obtained by environ. to meet our needs/wants
management of natural resources w/ goal of minimizing resource waste/sustaining supplies
renewed continuously and is expected to last forever (i.e. solar energy)
can be replenished quickly thru natural processes as long it is not used up faster than renewed (i.e. forests, freshwater, fresh air)
highest rate at which a renewable resource can be used *indefinitely* w/o reducing available supply
exceeding sustainable yield -- supply begins to shrink
fixed quantity in earth's crust
amount of biologically productive land/water needed to supply people
per capita ecological footprint
average ecological footprint of an individual in a given country
single, identifiable sources of pollutants
dispersed and often difficult to identify
harmful materials that can be broken down by natural processes
harmful materials that natural processes cannot break down
pollution cleanup (output pollution control)
cleaning up or diluting pollutants after they've been produced
pollution prevention (input pollution control)
reduces/eliminates the production of pollutants
CAUSES OF ENVIRONMENTAL PROBLEMS
population growth, unsustainable resource use, poverty, excluding environmental costs from market prices, trying to manage nature w/o knowing enough about it
set of assumptions/values reflecting how you think the world works
our beliefs about what is right and wrong with how we treat the environment
planetary management worldview
holds that we are separate from nature, that nature exists mainly to meet our needs/increasing wants, and that we can control the earth indefinitely
holds that we can/should manage the earth for our benefit but that we should be the managers (stewards) of earth
environmental wisdom worldview
holds that we are part of and totally dependent on nature and that nature exists for all species, not just us
making shift to more sustainable societies and economies
STEPS INVOLVED IN MAKING ENVIRONMENTAL DECISIONS
1) Identify problem 2) Gather scientific info3) Propose 1+ solutions 4) Project short- and long-term advantages/disadvantages of each solution 5) Decide and implement...
FOUR SCIENTIFIC PRINCIPLES OF SUSTAINABILITY
1) Reliance on solar energy2) Biodiversity 3) Nutrient Cycling4) Population Control
changes and innovations that lead to new technologies, products, and opportunities for profits
set of laws/regulations gov't. enforces and the programs it funds
environ. laws/regulations that are developed, implemented, and enforced
understanding of nature and how our actions affect it
not taking actions that cannot be reversed if a decision turns out to be wrong=
taking precautionary measures to prevent/reduce harm to environ.
net energy principle
avoiding widespread use of energy alternatives/technologies w/ low net en. yields
making decisions that help to prevent a problem from occurring/becoming worse
regulations and economic tools (i.e. green taxes) to ensure that polluters bear costs of pollutants/wastes they produce
public access and participation principle
citizens should have open access to environ. data/right to participate in creating environ. policies
human rights principle
all people have a right to live in an environ. that doesn't harm their health/well-being
environmental justice principle
establishing environ. policies so no group bears unfair share of burden created by pop., environ. degradation, or execution of environ. las
4 PRINCIPLES TO GOVERN USE OF PUBLIC LANDS
1) Used primarily for protecting biodiversity, habitats, ecosystems2) No gov't. tax breaks 3) Fair compensation for prop. use 4) Users should be fully responsible for environ....
PROPOSALS TO CONGRESS TO OPEN MORE FEDERAL LANDS FOR DEVELOPMENT
1) Sell @ less than market value 2) Slash fed. funding for admin. 3) Cut old-growth forests and replace w/ plantations 4) Open nat'l. parks, wildlife refugees, wilderness...
calculated that pop. of England would be getting so out of control that there wouldn't be enough resources
life on Earth is getting better (Julian Simon)
use all we want
use resources responsibly (conservationism and preservationism)
-used resources at sustainable rate-had knowledge of natural world-lived in "harmony with nature" b/c they didn't take more than they needed
3 Reasons Agriculture = Bad for Health
1) hunter-gatherers enjoyed varied diet, while early farmers obtained food from 1+ starchy crops2) starvation if crop failed3) agriculture clumped people together in crowded societies
What environmental trends result from our lack of sustainability?
-extinction-exceeding carrying capicities
Examples of nonrenewable resources
-oil-minerals-topsoil-energy sources-genetic diversity
Examples of renewable resources
What factors affect environmental degradation?
-population size-per capita consumption-technology
EHRLICH'S ENVIRONMENTAL IMPACT EQUATION
total environ. impact = population x per capita consumption x technology
-depletion of natural resources as positive (i.e. Brazil cuts down all forests and sells it, its GNP increases)-services such as pollution clean-up, cancer treatments, etc.
GNP Doesn't Measure
-quality of air, water, and other environ. factors-factors of resources
Solutions to measuring GNP
use environ. indicators which include costs of resource depletion, pollution, land degradation
Hiding harmful environmental costs from the market prices of goods and services causes all of the following, except:A. hides costs from consumersB. Hinders development of environmentally...
E. Causes increases in prices
The trickle-down effect describes how:A. Waterfalls flow during the fall seasonB. Toxic wastes filter down in landfillsC. Water percolates through loam soilsD. Economic growth increases...
D. Economic growth increases the number of jobs and helps the poor help themselves
Which of the following would not traditionally support an eco-economy?A. Shift taxes from wages and profits to pollution and wasteB. Improve energy efficiencyC. Shift from a carbon-based...
E. Decrease subsidies for alternative fuel vehicles
Levying taxes on each unit of pollution discharged into the air/water is an example of:A. tradable pollution rightsB. charging user feesC. regulationD. green taxesE. subsidies for beneficial...
E. subsidies for beneficial actions
social institution through which goods/services are produced, distributed, and consumed
human capital (human resources)
people's physical and mental talents, which provide labor, innovation, culture, and organization
manufactured capital (manufactured resources)
items such as machinery, equipment, and factories made from natural resources with the help of human resources
attempt to boost economic growth by increasing flow of matter and energy resources extracted from environ. thru their economic systems
estimate of a resource's future economic value compared to its present value
comparing estimated costs/benefits for actions
Genuine progress indicator equation
Genuine progress indicator = GDP + benefits not included in market transactions - harmful environmental and social costs
help include many of the harmful environmental/health costs of production and consumption in market prices
matter recycling and reuse economies
mimic nature by recycling and reusing most matter outputs instead of dumping them into environ.
Law of Conservation of Matter
-cannot be created nor destroyed-can change state or take place in chemical reactions-amount remains the same-can't run out of an element b/c it has a set amount
Environmental Effects of Mass Conservation
-waste products-we bury or dilute unwanted byproductsDILUTION IS NOT THE SOLUTION OF POLLUTION
splitting nucleus (atomic bomb)
combining 2 nuclei (sun, H-bombs)
First Law of Thermodynamics
no energy is created or destroyed in physical or chemical change
Second Law of Thermodynamics
always end up with less usable/lower-quality energy than started with
using scientific observations and measurements to arrive at a general conclusion/hypothesis
using logic to arrive at a specific conclusion
overthrowing scientific law
not yet considered reliable. opposite = reliable science
natural radioactive decay
isotopes spontaneously emit fast-moving subatomic particles (radioactive isotopes)
dense objects have nuclear change
less dense objects have nuclear change
increase or decrease change to a system
output of matter is fed back as input
1) Nitrogen fixation2) Conversion to ammonia3) Ammonia incorporated into proteins4) Ammonification: Ammonia released back into biosphere when organism dies5) Nitrification: bacteria...
PHOSPHORUS CYCLE (hint: only cycle that doesn't involve air at all)
-needed for ATP (energy) and DNA-found in rocks (PO4- ion)-we eat it as tertiary consumers-taken up by plants-very slow3 ways it enters:-hydrogen sulfide (H2S--rotten...
if any one abiotic factor is in short supply, it'll limit the size of a pop. in an ecosystem regardless of the abundance of other abiotic factors(phosphate, eutrophication [too many...
Hubbard Brook Experiment
attempted to measure effects of deforestation on loss of water and soil nutrients from a forestConclusions: -deforestation causes loss of nitrate ions from soil-losses of other...
members of 2+ species interact to gain access to same limited resources (i.e. food, light, space)
1 organism (parasite) feeds on body of, or energy by, other organism (host), usually by living in/on host
predator feeds direction on all or part of prey
benefits both species by providing each w/ food, shelter, or some other resource
benefits one species but has little/no effect on the other
species' way of life in a community and includes everything that affects its survival
competitive exclusion principle
no 2 species can occupy exactly the same niche
2 species interact, changes in gene pool of one species and causes both sides to become more competitive
some species evolve to reduce niche overlap
how characteristics of populations change in response to environ. conditions
POPULATION CHANGE EQUATION
(births + immigration) - (deaths + emigration)
proportions of individuals at various ages
capacity for pop. growth under ideal conditions
intrinsic rate of increase
rate pop. of a species would grow if it had unlimited resources
combination of all factors that act to limit growth of a pop.
carrying capacity (K)
max. pop. of a given species that a particular habitat can sustain indefinitely w/o being degraded
rapid exponential pop. growth followed by steady decrease of pop. growth until pop. size levels off
small offspring and given little/no parenting or protection
reproduce later in life and have small number of offspring w/ long life spans
top-down population regulation
pop. regulated thru predation
bottom-up population regulation
size of predator/prey controlled by scarcity of 1+ resources
ecosystem starts from scratch (no life to begin with)
ecosystem doesn't start from scratch (already has est. community)
where any additional stress can cause the system to change in an abrupt and irreversible way that often involves collapse
What are the four trophic levels?
-producers (plants)-primary consumers (herbivores)-secondary consumers (carnivores)-tertiary consumers (top carnivores)
Gross primary productivity (GPP)
amount of energy captured thru photosynthesis
gradual change in an area as one biotic community replaces another
Why does one biotic community replaces another?
b/c it is going toward a more mature community
idea that all living things are composed of cells
surrounded by a membrane and has a distinct nucleus
surrounded by membrane, but has no distinct nucleus and no other internal parts
all populations of diff. species that live in a particular place
all parts of earth's air, water, and soil where life is found
thin envelope of gases surrounding earth's surface
contains majority of air we breathe
trap heat and thus warm lower atmosphere
world's sunscreen--filters out most of sun's harmful UV raysalso where ozone is most abundant
consists of all water on or near earth's surface
core, mantle, crust
large regions such as forests, deserts, grasslands, w/ distinct climates and certain species adapted to them
THREE FACTORS THAT SUSTAIN LIFE ON EARTH
1) way of flow of high-quality energy (can't be recycled)2) cycling of matter/nutrients (can be recycled)3) gravity
LIMITING FACTOR PRINCIPLE
too much or too little of any abiotic factor can limit or prevent growth of a population, even if all other factors are at or near the optimal range of tolerance
all organisms that are the same # of energy transfers away from the original source of energy
organisms get energy they need by breaking down glucose (or other organic compounds) in ABSENCE OF OXYGEN
interconnected food chains
dry weight of all organic matter contained in its organisms
% of all usable chemical energy transferred as biomass from 1 trophic level to the next -- range from 2%-40%
Net primary productivity (NPP)
rate @ which an ecosystem's producers (usually plants) convert solar energy into chemical energy as biomass found in their tissues
biogeochemical cycles/nutrient cycles
elements and compounds that make up nutrients that move continually through air, water, soil, rock, and living organisms in ecosystems and in biosphere
collects, purifies, and distributes earth's fixed supply of H2O1) precipitation2) transpiration3) evaporation
approx. 90% of H2O that reaches atmosphere evaporates from surfaces of plants
1) carbon removed from atmosphere2) carbon goes into plants3) animals eat plants4) carbon from atmosphere into oceans5) carbon moves from living things to plants6) carbon back to atmosphere
1) nitrogen fixation** (N2 + 3H2 = 2NH3) in soil2) conversion to ammonia (NH3)3) NH3 used in proteins4) ammonification5)...
6CO2 + 6H2O ---> C6H12O6 + 6CO2
modifies what it eats
1 type of food it can live on (better when ecosystem is stable)
basis of whole ecosystem
if removed, whole ecosystem falls
not good-- it's always first to die b/c they need something specific
native and ONLY in that area
didn't coevolve -- invades ecosystem
1) sulfur enters atmosphere from natural sources2) H2S is released from active volcanoes and broken down by organic matter3) particles of sulfate enter atmosphere from sea...
Why is earth hotter at the equator than at the poles?
b/c the sunlight is more direct at equator
convection cell which moves moisture from equator to tropics and createst desert
EFFECTS OF WATER (WEATHER)
-has high heat capacity-absorbs heat during day w/ little change of temp.- gives off heat @ night-deserts have extremes in weather (hot to cold, hot to cold...)-areas near bodies of...
rotation of Earth, which causes deflection of wind
constant loop going from east
constant loop going from west
intertropical convergence zone (low pressure and little wind)
El Nino Southern Oscillation (ENSO)
winds are weak; weather is hot and wet
cold water, dry heat
What are three major climatic factors?
temperature, rainfall, sunlight
What are the 8 types of biomes?
1) tundra2) taiga3) temperate forest4) deciduous forest5) grassland6) chaparral7) desert8) tropical rainforest
Characteristics of TUNDRA
-temp: very cold winters with short, warm summers-water: frozen desert, often >15 in./year-sunlight: very little in winter, some in summer
Characteristics of TAIGA(northern coniferous forest)
-temp: very cold winters, warm in spring and summer-water: frozen for much of the year. summers often dry-sunlight: little in winter, fair amount in summer. needles always have sunlight
Characteristics of TEMPERATE DECIDUOUS FOREST
-temp: cool winters, snow; warmer spring and summer-water: plentiful w/ lots of rain in summer-sun: little in winter, plentiful in summer (warmth and water produce rapid decomposition...
Characteristics of GRASSLAND(savanna, plain)
-temp: warm-hot summers, cold winners-water: rainy, but often dry and vulnerable to fires-sun: plentiful in summer, less so in winter (frequent fires prevent trees from becoming est.)-scattered...
Characteristic of DESERT
-temp: very hot summers, cold winters-water: DEFINING VARIABLE-sun: plentiful, but bad given lack of water
Characteristics of CHAPARRAL(brush, sagebrush)
-temp: mild winters, warm-hot summers-water: light rain in winter, prolonged drought in summer-sun: plentiful, but lack of water limits growth to spring-fire is a normal occurrence
Characteristics of TROPICAL RAINFOREST
-temp: warm all year, little variation b/w summer and winter-water: bountiful at all times, rains over 100 in/year-sun: plentiful entire year-places least physical demands upon organisms,...
What happens when some solar radiation is reflected back into space?
What are the greenhouse gases?
water vaporcarbon dioxidemethanenitrous oxideCFC's (not natural source)
change b/w troposphere and atmosphere
change b/w atmosphere and stratosphere
NATURAL FORMATION AND DESTRUCTION OF OZONE
solar formation: 1) O2 +UV light ---> 2O ...
Why are CFC's good?
-"miracle chemical"-- can last forever-very stable-- don't burn or react w/ other chemicals-refrigerant-"freon"-low thermal conductivity-- great for insulation-inexpensive
Why are CFC's bad?
-reactive in upper atmosphere
Why don't most populations change much from year to year?
b/c they reach a carrying capacity as a result of environ. resistance
What 2 events increased human population growth rates?
Agricultural Revolution and Industrial Revolution
# of live births per 1,000 people in 1 yearto calculate: (birth rate - death rate) / 10
# of children a woman needs to replace her and her partner
Why does population continue to grow after reaching replacement rate?
if a large portion of population is under 15, there are a lot of future mothers; even if each of those girls have only 2 children, the population won't stabilize until their are too...
What are the 3 categories of population pyramids?
0-14 years old15-44 years old45+ years old
EHRLICH'S ENVIRONMENTAL IMPACT EQUATION
total env. impact = pop. x per capita consumption x technology