APES Chapter 1 Environmental Problems, Their Causes and Sustainability “At present we are stealing the future, selling it in the present, and calling it gross domestic product.” Paul Hawken Basic Terms Environment- everything that affects living organisms Ecology-science that studies relationships b/t organisms and environment Human Population The human race plays a key role in important issues we will be discussing the whole year – – – – – – Population growth Resource use Poverty Loss of biological diversity Pollution Global climate change Population Growth Linear Linear growth- no consistent doubling time with straight line graph – Slow growth Population Growth Exponential Exponential growth- quantity increases at a constant rate per unit time – Starts slowly, but grows enormously due to doubling – Addition to population proportional to current size Larger populations add more people than smaller ones growing at same rate 10% growth of 100,000 people = 10,000 added/yr 10% growth of 1,000,000 people = 100,000 added/yr These larger populations will then increase their population considerably Population Growth Exponential Doubling time- the amount of time it takes a population to double its size. – Exponential growth shows a doubling time – Rule of 70: 70/rate (%) = doubling time 70 divided by the growth rate as a percentage = d.t. – The higher the growth rate, the less time it takes to double – i.e.: growth of populations of people and bacteria, savings accounts, etc. Let’s See If the Rule of 70 Works! 10% fixed growth rate….what is doubling time? 70/10 = 7 year doubling time (.10)(100) (.10)(110) (.10)(121) (.10)(133) (.10)(146) (.10)(160) (.10)(176) 100 people to start =+10 10% growth 110 total # of people at end of year 1 =+11 121 end of year 2 =+12 133 end of year 3 =+13 146 end of year 4 = +14 160 end of year 5 = +16 176 end of year 6 = +17 193 end of year 7—almost doubled! Population Size vs. Time 450 400 How would we figure out doubling time from this graph of population growth? 350 300 100 250 200 150 100 year year year year year year year year year year year year year year year 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Population Size vs. Time 450 400 Using the graph you can see that after 7 years population has nearly doubled from 100 to 200 350 300 100 250 200 150 100 year year year year year year year year year year year year year year year 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Population Growth World growth has slowed, but still growing exponentially at an annual growth rate of 1.25%/year – Not much? – Calculate doubling time (70/1.25 = ? years) 1950-2004 2.56.4 billion (6,400,000,000) – 80,000,000 people added in 2004 – 9100/hour Growth more rapid than Earth can support Projected 8-12 billion by end of century, depending on growth rate 16 15 ? 14 13 12 ? 10 9 8 ? 7 6 5 4 3 2 Black Death–the Plague 2-5 million 8000 years Hunting and gathering 6000 4000 2000 Time Agricultural revolution 1 2000 B.C. 0 2100 A.D. Industrial revolution Billions of people 11 Resource Use Global economic output is a rough measure of human resource use More people due to exponential growth and economic growth ↑ resource use Poverty 22 fold ↑ in economic growth b/t 1950 and 2004 50% of people still trying to survive off < $3/day To survive they must deplete and degrade environment Poverty Wealth is becoming increasingly concentrated, with the richest 20% receiving most of the world's income (82.7%). Loss of Biological Diversity Premature extinction of species due to habitat degradation 1%/year IRREVERSIBLE! i.e. cutting down forests due to farming and development Pollution Pollution- presence of substances at high enough levels to harm living organisms due to: – Natural occurrences= biogenic (volcanic eruptions) – Human activities= anthropogenic (burning fossil fuels, using pesticides, etc.) Disrupt support systems of organisms Pollution Occurs more in urban areas Can contaminate area where produced or be carried away by wind or water Factors that determine damage a pollutant can cause: – – – – Concentration Persistence Chemical nature Rate of degradation Pollution Point sources- single, identifiable – Cars, smokestacks – Easier to identify and control Nonpoint sourcesdispersed, difficult to identify – Pesticides runoff and spray Pollution Prevention (output control) – Stop before it starts – Easier to do – Less expensive to reduce to acceptable levels—regulation Cleanup – Temporary bandage – Only moves pollution to another site – Expensive Climate Change Population growth, resource use, poverty, and loss of biological diversity contribute to climate change – Global warming – Cycle continues What the Earth Provides Us Sun and Earth’s Natural Capital Capital—baseline wealth used to sustain (i.e. a business or life) Income--output derived from an investment of capital All life and economies depend on solar and natural capital. What the Earth Provides Us Solar Capital/ Energy Solar capital- direct sunlight and indirect forms of renewable solar energy Provides 99% of the energy used on earth to sustain life. Biomass (plant matter) made by plants during photosynthesis using solar energy (i.e. firewood, food, coal) Hydropower, windpower, and solar power What the Earth Provides Us Natural Capital Natural capital- Earth’s resources and ecological services – – – – – – – Air Water Soil Forests Fishery Minerals Natural water and air purification RESOURCES Water Air Energy Soil Minerals NATURAL CAPITAL Nutrient Recycling Population Control Pollution Control Climate Control Biodiversity Waste Treatment SERVICES Pest & Disease Control What the Earth Provides Us Natural Resources Resource-anything obtained from environment to satisfy needs OR wants – – – – – Food Water Shelter Transportation Recreation Natural resources are classified as – Perpetual – Renewable – Nonrenewable Population and World Resources-24min Resources Perpetual Direct solar energy Nonrenewable Winds, tides, flowing water Fossil fuels Metallic minerals Nonmetallic minerals (iron, copper, aluminum) (clay, sand, phosphates) Renewable Fresh air Fresh water Fertile soil Plants and animals (biodiversity) What the Earth Provides Us Perpetual Resources Perpetual resources- renewed continuously – Solar energy – Winds – Flowing water Resources we cannot drain--yet What the Earth Provides Us Renewable Resources Renewable resources- can be renewed or replenished fairly rapidly by natural processes – – – – Fresh air Fresh water Plants Animals Renewable only as long as we don’t use them quicker than they’re renewed! What the Earth Provides Us Renewable Resources Sustainable yield -highest rate that a renewable resource can be used indefinitely w/o reducing its available supply (capital) – LIVE OFF INCOME, NOT CAPITAL Environmental degradation –degrading environment in any way – i.e. using more than sustainable yield causing resource capital to shrink (degrading environment) – LIVING OFF INCOME AND CAPITAL What the Earth Provides Us Renewable Resources “Tragedy of the Commons” Garrett Hardin, 1968 Said we are exploiting and degrading publicly owned, common resources. Need to take no more than sustainable yield. What the Earth Provides Us Renewable Resources Possible solutions to the tragedy? – Limit access – Reduce population – Convert free access to private Private owners environmentally conscientious? How do you make global resources (oceans and air) private? Will restricted access foster lack of appreciation for these resources? What the Earth Provides Us Renewable Resources Government has laws and treatises that regulate access to commonly owned resources – Hunting licenses – Fishing licenses – National Park rules and regulations – IDEM standards What the Earth Provides Us Renewable Resources Ecological footprint- amt of biologically productive land and water needed to supply us with the renewable resources we use and absorb or dispose of our waste How much of Earth’s natural capital and biological income we use EVERYTHING we do leaves an effect our environment—our footprint Renewable resources are being depleted and degraded to support our lifestyles Total Ecological Footprint (Hectares) Country 3 billion hectares United States The Netherlands India 62 million hectares 880 million hectares What the Earth Provides Us Renewable Resources Per capita- per person Per capita ecological footprint= total footprint/total population – Humanity’s per capita ecological footprint exceeds Earth’s biological capacity by 15% – We are exceeding sustainable yield and dipping into our capital – i.e. country has 1,000,000 hectares of ecological footprint and 100,000 people: 1,000,000 ha/ 100,000 people = 10 ha/person Per Capita Ecological Footprint (Hectares of land per person) Country 9.6 United States 3.8 The Netherlands India 0.8 Number of Earth’s Earth’s Ecological Capacity 1961 1965 1970 1975 1980 1985 1990 1995 2000 2005 What the Earth Provides Us Nonrenewable Resources Nonrenewable resources- those we can deplete fixed quantity Energy resources – Gas, Coal Metallic mineral resources – Iron, Copper Nonmetallic mineral resources – Salt, clay – **These nonrenewables are economically depleted when it costs too much to obtain what is left Resources Perpetual Direct solar energy Nonrenewable Winds, tides, flowing water Fossil fuels Metallic minerals Nonmetallic minerals (iron, copper, aluminum) (clay, sand, phosphates) Renewable Fresh air Fresh water Fertile soil Plants and animals (biodiversity) Resource production Area under curve equals the total amount of the resource. Economic depletion (80% used up) Time What the Earth Provides Us Nonrenewable Resources Solutions for preserving our nonrenewable resources – Try to find more – Recycle/Reuse – Waste/Use less – Substitute – Wait millions of years Economic Growth Economic growth- an ↑ in the capacity of a country to provide people with goods and services needed – Measured by change in country’s: GDP (Gross Domestic Product)- annual market value in $ of all goods and services produced WITHIN a country GNP (Gross National Product)- annual market value in $ of all goods and services produced by a country’s businesses THROUGHOUT THE WORLD Economic Growth Country’s standard (quality) of living gauged by – Per capita GDP= GDP/country’s population – Per capita GNP = GNP/country’s population Countries with larger populations have to spread the wealth thinner Lower per capita GDP lower standard of living China Economic Development Economic development- improving living standards by economic growth UN classifies countries as economically developed or developing based on Human Development Index (HDI): – Standard of living (per capita GDP) – Life expectancy – Literacy What country is #1? HDI List Economic Development Developed (MDC): US, Canada, Japan, etc. – High life expectancy, literacy, industrialization and per capita GDP Developing (LDC): Africa, Asia, Latin America, India – Lower life expectancy, literacy, industrialization and per capita GDP – 97% of world’s projected ↑ in population is expected to take place in these countries 12 11 Population (billions) 10 9 World total 8 Developing countries 7 6 5 4 Developed countries 3 2 1 2000 2050 1950 Year 2100 Percent of World’s 19 Population 81 Population growth rate Wealth and income Resource use 0.1 1.6 85 15 88 12 Pollution and waste 75 25 Developed countries Developing countries Trade-Offs Economic Development Good News Bad News Global life expectancy doubled since 1950 Life expectancy 11 years less in developing countries than in developed countries Infant mortality cut in half since 1955 Infant mortality rate in developing countries over 8 times higher than in developed countries Food production ahead of population growth since 1978 Harmful environmental effects of agriculture may limit future food production Air and water pollution down in most developed countries since 1970 Air and water pollution levels in most developing countries too high Number of people living in poverty dropped 6% since 1990 Half of world’s people trying to live on less than $3 (U.S.) per day Globalization Globalization- process of social, economic and environmental changes that lead to increased interconnectedness throughout world – – – – Information (internet) International trading Technology Human mobility **One country can’t be environmentally sustainable without the others!! Environmental and Resource Problems The Big Five Causes Major causes of problems 1. Population growth 2. Wasteful resource use 3. Poverty 4. Poor environmental accounting 5. Ecological and environmental ignorance Environmental and Resource Problems The Big Five Causes 1. Talked about population growth 2. Wasteful resource use – Affluenza High stress High debt Bankruptcies Overuse of resources Environmental and Resource Problems The Big Five Causes 3. Poverty – Survival at the expense of environment – Live in areas w/ greater risk of natural disasters – Work in unsafe, unhealthy conditions – Life expectancy low – Many children for economic security – Death from preventable causes Environmental and Resource Problems The Big Five Causes 4. Poor environmental accounting – Not including environmental cost of economic goods and services in the market price – Cleanup and waste expensive and corners cut 5. Ignorance – Many have no idea about the impact of their actions – Many “live for today” Environmental and Resource Problems Problem and Cause Connection Environmental impact (I) affected by interaction b/t population size (P), resource consumption (A) and technology (T) Technology can be helpful or harmful I = P X A X T Developing Countries X X Population (P) X Consumption per person (affluence, A) X = Technological impact per = unit of consumption (T) Environmental impact of population (I) Developed Countries X X = Living More Sustainably Two School of Thought on How It’s Done Environmentalists: – Eliminate waste and stop depletion and degradation to sustain our capital Others: – Say environmentalist are exaggerating and/or it is a hoax – Man can overcome problems w/ ingenuity, economic growth, and technology Living More Sustainable What We Must Do Protect solar and natural capital (wealth) and live off the resources they provide (income) Meet current needs of people without compromising the needs of future generations –NO DEPLETION OF CAPITAL –NO SELFISHNESS Identify how Earth sustains itself and apply this info to our lifestyles and economies – Gaia hypothesis Rewards to encourage more sustainable forms of economic growth and penalties to discourage Current Emphasis Sustainability Emphasis Pollution cleanup Pollution prevention (cleaner production) Waste disposal (bury or burn) Waste prevention & reduction Protecting species Protecting where species live (habitat protection) Environmental degradation Environmental restoration Increased resource use Less wasteful (more efficient) resource use Population growth Population stabilization by decreasing birth rates Depleting and degrading natural capital) Protecting natural capital and living off the biological interest it provides Is Our Present Course Sustainable? Guidelines for the Earth Never leave it worse than you found it Take only what you need Sustain diverse living organisms Maintains Earth’s capacity for self-repair Don’t waste Don’t pollute Decrease population