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How human activities impact the Earth's ecosystems I. Standard 4 Key Idea 7 PI 7.1 MU 7.1 c , PI 7.2 MU 7.2a – 7.2c. Bell Ringer Question. Give examples of environmental problems that you have heard from newspapers or TV news. Greenhouse effects Air pollution Nuclear energy wastes - PowerPoint PPT Presentation
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How human activities im-pact the Earth's ecosys-
tems IStandard 4 Key Idea 7 PI 7.1 MU 7.1 c , PI 7.2
MU 7.2a – 7.2c
Bell Ringer Question
• Give examples of environmental problems that you have heard from newspapers or TV news.
Greenhouse effectsAir pollution
Nuclear energy wastesWater pollution, etc
Summary of what we are going to learn this class and next class
1. Biodiversity crisis2. Land use and pollution3. Global warming4. Ozone layer depletion 5. Energy crisis
Today
Next class
1. Biodiversity crisis 1) Adding or removing specific organ-
isms intentionally or unintentionally • e.g. planting large expanses of one crop
reduces the biodiversity of the area. • e.g. Zebra mussels introduced by a foreign
ship dominated the Great Lakes, killing other native mussel shells. U.S. spent about $ 5 billion each year to recover the environment.
Solomon, Berg, and Martin. (2008). Biology. Belmont, CA: Thomson Higher Education.
http://undertheriffles.com/tag/zebra-mussels/
1. Biodiversity crisis con’t
2) Commercial harvest/ unregulated hunting
http://www.talking-naturally.co.uk/egypt-unregulated-bird-hunting-and-the-malta-connection/
1. Biodiversity crisis con’t
2) Habitat fragmentationBreakup of large areas of habitat into
small segments.
http://wildflowerturfblog.wildflowerturf.co.uk/2012/02/16/habitat-fragmentation/
Why is biodiversity important? (handout)
• http://www.youtube.com/watch?v=HA3xNMJnFuo
2. Land use and pollution • Human population increase occupy more
land as living space or farmland. Less natural habitat for many native
species. Soil erosion : less available habitat for
many species
http://troutstreamresearch.safl.umn.edu/
Water pollution: Causes
• Heat• Sewage• Fertilizers (i.e. chemical phosphate)• Pesticides• Heavy metals (i.e. mercury)• Dioxin• Bacteria • Etc.
http://www.sciencedaily.com/releases/2009/01/090118200636.htm
Water pollution con’t
http://waterstse.wordpress.com/world-impact/
Video: Water pollution (Answer questions on the handout.)
• http://www.youtube.com/watch?v=fxZ4IMpM45Y
Discuss the following problem with your partner.
Regents June 2013 # 64
Possible answers
— Increase plant growth might block sunlight from penetrating the water, killing off other plant species.
— Increase plant growth could disrupt the food chain by blocking light to the ecosystem.
— There will be a change (increased/decreased) in the oxygen supply for fish.
— There will be a change (decreased/increased) in the food supply for herbivores.
— can result in more decaying material causing the lake to fill in.
— Excessive plant growth can limit animal movement/alter habitat.
Air pollution
• Burning fossil fuels pollutants such as carbon monoxide, hydrocarbons, nitrogen oxides, sulfur oxides, and particulate mat-ter.
• When these pollutants are combined with water, they make acid rain.
http://sayiamgreen.com/blog/2009/09/the-10-most-polluted-cities-in-the-world/
Video: Air pollution (Answer questions on the hand-out.)
• http://www.youtube.com/watch?v=oOk5G5vd2lw
3. Global warming
• Global warming: a gradual increase in the average temperature of Earth as a result of greenhouse gases
Global warming
http://data.giss.nasa.gov/gistemp/graphs_v3/Fig.A2.gif
Global warming: CausesGreenhouse effectsBurning fossil fuels emits carbon diox-
ide, and other gases these gases trap the sunlight, causing the green-house effect.
http://afraidoftree.blogspot.com/2011/01/assigment-forest-ecology-greenhouse.html
Video: Global warming (Answer questions on the handout.)
• http://www.youtube.com/watch?v=ROZJmX73FF4
Exit ticket
Regents Exams