Flashcard Warm-up Biodiversity Variation in the different species that live in an ecosystem. Depends largely upon the variation of plant life, which depends on the amount of precipitation. Sustainability Wise use of earth’s resources to provide the best for people AND the environment both NOW and in the FUTURE

UNIT 3 HUMAN IMPACT Help!!!!!

Human Population Growth Too many people = environmental problems!  What caused human population growth?  Causes: Agricultural Revolution- more food to support more people Industrial Revolution- improvements in technology, and medicine, increased birth rate and decreased death rate Urbanization – development of cities, economic and social development

Human population Growth: J curve

Effects of Human Population Growth  Overcrowding  Increase in pollution- ALL environmental problems relate back to human overpopulation!  Decrease of Natural Resources: More people require more resources  Increase land use

Solution:  Zero Population Growth: birth rate = death rate; china offers tax incentives for having one child; education, birth control  Conservation: wise and careful use of resources  Reduce: use less materials  Reuse: use products more than once  Recycle: return products to be reprocessed  Sustainability – ensuring the availability of resources and a stable environment for future generations.

Ticket Out the Door  What three events allowed for the fast growth of human population?  What type of curve does human population growth look like when graphed?  Give one example of a way you can act to conserve our resources on earth.

Flashcard Warm-up (front of card) Environmental Problems  Overpopulation – cause of all environmental problems  Global warming – too much CO2 in atmosphere increases average global temperature ->flooding, climate change  Ozone depletion – CFC’s destroy ozone layer -> increase UV radiation exposure -> increases cancer and crop damage

What’s in a Histogram? Ages, percent of males and females in the population What can a histogram reveal? An increasing, stable or decreasing population

Mythbusters Video:discoveryeducation.com Are cows causing global warming?  Independent Variable?  Dependent Variable?  Background info: what do they tell us about methane  How much methane does one cow produce?  Why is methane bad for the environment?

Global Warming: unnatural warming of the Earth  Cause: Excessive greenhouse gases (carbon dioxide CO 2 and methane CH 4 ) in the atmosphere trap heat, leading to an abnormal increase in earth’s surface temperature  CO 2 comes from burning fossil fuels  CH 4 from landfills and cow farts!

Effect: It’s like the earth has a fever! Have you seen the movie “ The Day After Tomorrow”?  increase in temperature (2-4 degrees Celsius), weather patterns will change worldwide, polar ice caps may melt, flooding coastal cities and contaminating drinking water with saltwater.

Ozone Depletion: Has nothing to do with global warming!  Cause: CFCs (chlorofluorocarbons), once used as refrigerants and in aerosol cans destroy ozone molecules in the upper atmosphere leading to thinning or a hole UV radiation is NOT heat!!!!

Ozone depletion :  Effects: Harmful UV radiation reaches earth causing increased numbers of sunburns, skin cancer, cataracts (leading to blindness), and crop damage.

Acid Rain  Cause: emissions (sulfur and nitrous oxides from cars and factories react with oxygen and water)

Acid Rain:  Effects: A lowered pH disrupts aquatic ecosystems, makes soil less fertile, harms plant life, and damages human property.

Water Quality  Cause: sediments, oil, fertilizers from land, illegal dumping, acid rain, raw sewage, heated water from power plants  Effect: Disease, habitat destruction

Ticket Out the Door  1.What three events allowed for the fast growth of human population?  2. Use the histogram to determine if the population is increasing or decreasing. Explain how you know.  3.Explain how Global warming and Ozone depletion are NOT related.  How are they different??

Flashcard Warm-up  Global Warming  Excessive greenhouse gases (carbon dioxide and methane) trap heat in our atmosphere causing an increase in Earth’s temperatures. Biomagnification Pesticides and contaminants “move up the food chain” Chemical contaminants are stored (bioaccumulation) and magnified in organisms higher up the food chain because predators accumulate pesticides in the bodies of their prey.

Flashcard Warm-up Biomagnification  Pesticides and contaminants “move up the food chain”  Chemical contaminants are stored (bioaccumulation) and magnified in organisms higher up the food chain because predators accumulate pesticides in the bodies of their prey.

Biodiversity Loss/ Habitat Destruction  Causes:  Deforestation: cutting down forests for wood, and farming  Draining/filling wetlands  Bioaccumulation: Greatest accumulation in animals higher in the food chain  Biomagnification Magnified greatest in animals higher in the food chain  Endangerment/extinction: Endangered species are t risk of becoming extinct. Extinction refers to the loss of a particular species.

Technology  Satellites: track changes global temperature and the ozone layer  Ice Core Analysis: Measure gases (CO 2 ) that were once in atmosphere  Census Data:

Census Data: DevelopingStable

Ticket out the Door  1.What is biomagnification?  2. What is bioaccumulation?  3. What organisms are most affected by biomagnification?