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WHAT IS ENVIRONMENTAL SCIENCE? IS IT? A stream flowing through a wilderness area? A rainforest canopy alive with blooming flowers? OR Your backyard? ANSWER: ALL OF THE ABOVE It is more than you see—it is a complex web of relationships that connects us with the world we live in It is the natural world + things produced by humans ENVIRONMENTAL SCIENCE ENVIRONMENTAL SCIENCE: Study of how humans interact with the environment GOAL OF ENVIRONMENTAL SCIENCE: Understand & solve environmental problems HOW IS THIS DONE? Env. Scientists study 2 main types of interactions btwn humans & environment How we use natural resources (water, plants, etc) How our actions alter our environment Environmental Science is an interdisciplinary science (involves many fields of study) Env Scientist investigates how the nesting behavior of bees is influenced by human activities such as the planting of suburban landscaping. Ecology: study of how living things interact with each other and with their nonliving environment Ecologist studies the relationship btwn bees & the plants bees pollinate WHAT IS MEANT BY: SCIENTISTS AS CITIZENS, CITIZENS AS SCIENTISTS? ??? ENVIRONMENT THROUGH HISTORY A. HUNTER-GATHERERS B. THE AGRICULTURAL REVOLUTION C. THE INDUSTRIAL REVOLUTION HUNTER GATHERS People who obtained food by collecting plants & by hunting wild animals or scavenging their remains Small groups of people that migrated from place to place as different types of food became available Affect Environment— Spread plants to areas where plants did not originally grow In N. Am. a combination of rapid climate change & over hunting may have lead to disappearance of some larger mammal species ( giant sloth, giant bison, mastodon) AGRICULTURAL REVOLUTION Eventually hunter-gather groups began to collect seeds of plants & domesticated some of the animals This allowed human populations to grow @ unprecedentated rate An area of land can support up to 500x as many people by farming as it can by hunting-gathering As pop. grew conc. in smaller areaspressure on local env. Changed food we eat (domesticated vs. wild species) Farmland destroyed habitat Slash-and-burn agriculture Replacing forest with farmland on large scale soil loss, floods, water shortage INDUSTRIAL REVOLUTION Mid 1700’s Involved shift from energy sources (animal muscle to fossil fuels, oil, coal) Changed society greatly: ↑ efficiency of agriculture, industry, & transportation Introduced many + changes Light bulb, ↑ sanitation & medical care Also came new env. problems Artificial substances (plastics, artificial pesticides & fertilizer) in place of raw animal & plant Most modern env. problems began during Industrial Revolution This photograph was taken in 1968 by the crew of Apollo 8. Photographs such as this helped people realize the uniqueness of the planet we share. E A R T H Earth is essentially a closed system Closed System: the only thing that enters Earth’s atmosphere in LARGE amts is ENERGY from the SUN & the only thing that leaves in LARGE amts. is HEAT PROBLEMS WITH A CLOSED SYSTEM 1. Some resources are limited As pop grows ↓ Resources will be used more rapidly ↓ 2. Chance that we will produce more waste more quickly than we can dispose of Most Environmental Issues Can Be Grouped Into 3 Categories 1. RESOURCE DEPLETION 2. POLLUTION 3. LOSS OF BIODIVERSITY 1. RESOURCE DEPLETION Natural Resource: any natural material used by humans Renewable: Non-renewable: Renewable & Nonrenewable Resources RENEWABLE NONRENEWABLE Renewable & Nonrenewable Resources RENEWABLE NONRENEWABLE ENERGY FROM SUN METALS Iron, Aluminum, & Copper Nonmetallic materials Salt, Clay, Sand FOSSIL FUELS WATER WOOD SOIL AIR 1. RESOURCE DEPLETION Natural Resource: any natural material used by humans Renewable: can be replaced relatively quickly by natural processes (fresh water, air, soil, trees, crops) Non-renewable: sources that form at much slower rate than the rate consumed (minerals, fossil fuels) Once used up- will take millions of yrs to replenish Depletion: a large fraction of resources that have been used up Deforestation: trees harvested faster than they grow 2. POLLUTION Pollution: an undesired change in air, water, or soil that adversely affects the health, survival, or activities of humans or other organisms 2 TYPES of POLLUTANTS 1. Biodegradable Pollutants: pollutants that can be broken down by natural processes. Ex: human sewage, newspapers Only a problem if they accumulate faster than they can be broken down 2. Nondegradable Pollutants: pollutants that CAN’T be broken down by natural processes Ex: Mercury, lead, some types of plastic B/c don’t break down easily can build up to dangerous levels in env. 3. LOSS OF BIODIVERSITY Biodiversity: number & variety of species that live in an area. Extinction is a natural process Only limited info about how modern extinction rates compare with those of other periods in Earth’s history All species have economic, scientific, aesthetic, recreational value…so it is important to preserve them THE ENVIRONMENT & SOCIETY How does a society use/share a common resource? A neighborhood park? Open ocean?--- not owned by any nation YET People from many countries use the ocean for fishing & transportation “TRAGEDY OF THE COMMONS” 1968- ecologist Garrett Hardin published essay “Tragedy of the Commons” Described the attitude with which people use resources & became the theoretical backbone of the environmental movement A common theme is the idea of bioethics “TRAGEDY OF THE COMMONS” Hardin argued: Main difficulty in solving environmental problems is the conflict between short-term interests of individuals AND long term welfare of a society “TRAGEDY OF THE COMMONS” To illustrate his point he used example of the commons Commons: area of land that belonged to the whole village “TRAGEDY OF THE COMMONS” It was in best short-term interest of an individual to put as many animals as possible “If I don’t use this resource, someone else will” HOWEVER If too many animals grazed on the commons animals destroy grass now everyone suffered EVENTUALLY Commons were replaced by closed fields owned by individual who were careful to prevent overgrazing POINT OF HARDIN’S ESSAY? Someone or some group has to take responsibility for maintaining a resource If no one takes that responsibility the resource can be overused & become depleted WHAT HARDIN DID NOT CONSIDER Social nature of humans- we live in groups & depend on one another We can solve environmental problems by planning, organizing, considering scientific evidence, proposing a solution The solution may override interests of indivual in short term BUT improves environment for everyone in long term Earth’s Natural Resources are our modern “COMMONS” ECONOMICS & THE ENVIRONMENT In addition to social pressures—economic forces influence how we use resources A. Supply & Demand B. Cost & Benefits C. Risk Assessment SUPPLY & DEMAND When the demand for a product increases while the supply remains fixed, the cost of the product will increase. Ex.: if the supply of oil decreases: 1. Pay higher price 2. Use less oil 3. find new sources of energy COST & BENEFITS Cost of environmental solutions can be high Cost-benefit analysis: balances the cost of action against the benefits one expects from it. To INDUSTRY: the cost of pollution control may outweigh the benefits BUT To a nearby COMMUNITY: benefits may be worth the higher price RISK ASSESSMENT Tool that helps us to create cost-effective ways to protect our health & environment One of the costs of any action is the risk of an undesirable outcome DEVELOPED vs. DEVLOPING COUNTRIES DEVELOPED COUNTRIES Higher avg. incomes Slower pop. Growth Diverse industrial economies Stronger social support system USA, Canada, Japan, countries of W. Europe DEVELOPING COUNTRIES Lower average incomes Faster population growth Simple & agricultural based economics Lack of social support systems African nations, Some Asian areas DEVELOPED vs. DEVLOPING COUNTRIES Environmental problems in developed countries tend to be related to consumption In developing nations, the major environmental problems are related to population growth WHAT DO YOU THINK THE ENVIRONMENTAL PROBLEMS OF EACH COMSUMPTION PATTERN ARE? Consumption Trends Ecological Footprint: shows the productive area of Earth needed to support one person in a particular country For a person in a developed country –the ecological footprint is an avg. 4x as large as a person in a developing country Developed nations use ~ 75% of the world’s population, even though they make up only ~ 20% of the world’s population. Critical Thinking Environmental Problems are complex Balance between rights of individuals/property owners and society as a whole Be careful when reading about issues for “BIAS” Bias in Environmental Issues Passion for cause may lead to distortion of facts Political clout may oversimplify environmental impact Media sensationalizes issues Learn to think critically, consider the source, listen to many viewpoints SUSTAINABILITY