2 What is environmental science? Environmental science is the study of the impact of humans on the environmentGoals of env sci – to understand and solve environmental problemsMany fields of study contribute to environmental science:Biology, earth science, physics, chemistry, social sciences
3 Let’s brainstorm – some problems in the world today and their solutions: Environmental ProblemsSolutions to Problems
4 In your opinion, why have people let the environment suffer??
5 What is causing so many of our environmental problems? Agricultural revolution and industrial revolution have allowed the human population to grow much faster than it had ever grown before.Medicine and sanitation helped increase populationIncreased population increased demand for Earth’s resources!About 7.2 billion people in world today!
6 Let’s think……. What happens when there are too many people: In class? In Livingston?In the U.S.?In the world?
7 3 main environmental problems 1. resource depletion – we are using up too many of our natural resources!2. pollution- undesired change in air, water or soil that adversely affect health, survival or activities of humans or other organisms3. loss of biodiversity- a decrease in number and variety of species
8 Resource DepletionResources are depleted when a large fraction has been used upCan we deplete renewable resources?As the world’s population increases, what happens to its resources?
9 Problem 1 – Resource Depletion Natural resource – any material that is used by humansNon-renewable resource – forms at a much slower rate than it is consumed; once supply is used up, it will take millions of years to replace itFossil fuelsmineralsRenewable resource – resource that can be replaced relatively quickly by natural processesAir, water, soil, trees and crops
10 Problem 2 – Pollution What is pollution? AIRLANDWATER
11 Problem 3 – Loss of Biodiversity Biodiversity – number and variety of speciesWhy is there a loss of biodiversity?What are some animals that are endangered or extinct? (remember our projects!)
12 The Tragedy of the Commons Garrett Hardin said that the main difficulty in solving environmental problems is the conflict between the short-term interests of individuals and the long-term welfare of society
13 Look at the diagrams of grazing sheep…. When land was held in common, individuals tended to graze as many animals as possible. Overgrazing led to destruction of land.When commons were replaced by enclosed fields owned by individuals, people tended to graze only the number of animals that the land could support.
14 Tragedy of commons http://www.youtube.com/watch?v=FTurihxSTnI Great pacific garbage clipGpgp clip
15 Ecological footprint video clipTragedy of the commons animation
16 Ecological FootprintEcological footprint- productive area of earth needed to support one person in a particular countryHow much of the Earth’s resources a person/country usesLook at table, which country has largest ecological footprint?Why?Which countries have larger ecological footprints, developed or developing?
17 Simple and agriculture-based economies Developed countriesDeveloping countriesLower average incomesSimple and agriculture-based economiesRapid population growthHigher average incomesSlower population growthDiverse industrial economiesStronger social support systemsUS, Canada, Japan
19 What can YOU do to reduce your ecological footprint???
20 What is poverty?Poverty - state of being poor; the state of not having enough money to take care of basic needs such as food, clothing, and housing
21 People that live in poverty have __________ (great/little) healthcare__________ (great/little) education__________ (great/little) access to food__________ (great/little) access to water__________ (few/many) children
22 An __________ (increase/decrease) in population creates an ___________ (increase/decrease) in resources which creates an (increase/decrease) in poverty
23 sustainabilitySustainability – the condition in which human needs are met in such a way that a human population can survive indefinitelyAre we living in a sustainable world right now?Sustainability is the balance between the humans and the environment!