How human activities im-pact the Earth's ecosys-

tems II

http://ian.umces.edu/blog/2013/02/12/managing-for-sustainable-ecosystems-our-hu-man-role/

Bell ringer activity • Have you heard of the ozone layer?Write down what you think causes the

ozone layer depletion.chemicals :chlorofluorocarbon (CFC)

4. Ozone layer depletion

4. Ozone layer depletion con’t• The ozone layer protects people from

UV light. (Especially, UVB light)

http://www.epa.gov/ozone/science/q_a.htmlhttp://www.epa.gov/ozone/science/sc_fact.html

4. Ozone layer depletion con’t

• Ozone

-Blue-Has a strong odor.

• Chlorofluorocarbons (CFCs) are chemicals that were used in aerosol cans, refrigerators, etc. • When CFCs and other pollutants are

broken down by UV light, they dam-age the ozone layer.

4. Ozone layer depletion con’t

• Ozone hole over Antarctica • More UVB light can causeskin cancer and other harmful effects onsome organisms.

4. Ozone layer depletion con’t

4. Ozone layer depletion con’t

• Many countries banned or reduced the production of CFCs.

• The ozone layer will be recovered in about 50 years.

http://www.epa.gov/ozone/science/sc_fact.html

Video: ozone layer depletion (Fill out the handout.)

• http://www.youtube.com/watch?v=6QyI3Yo1sf4

5. Energy consumption

http://www.eia.gov/forecasts/ieo/world.cfm 1 Btu = 1055 joules

5. Energy consumption con’t

http://www.eia.gov/forecasts/ieo/world.cfm

5. Energy consumption: fossil fuelsPositive effects of fossil fuels

Negative effects of fossil fuels

-have provided people with energy

-have been relatively cheap

-Pollution: burning fossil fuels produces carbon dioxide and causes global warming and acid rain.-Fossil fuels are limited, and the prices will go up in the future.

(Thaddeus, 2010)

Possible solutions to the problems with fossil fuels

•Nuclear energy •Renewable energy

-Solar energy -wind energy-Geothermal-Bioethanol

•Reducing energy consumption, etc.

–(Thaddeus, 2010)

Possible solutions to the problems with fossil fuels

• All the possible alternate energy sources have advantages and disad-vantages.

• More countries try to switch to alter-native energy sources.

Fuel Mix for U.S. Electricity Generation

http://www.epa.gov/cleanenergy/energy-and-you/index.html

Video: Japan’s wind power• http://www.cnn.com/video/?/video/wo

rld/2013/03/11/zolbert-japan-wind-power.cnn

Group activity • Work in groups of four.• Write down every vocabulary word

we have learned in this unit: one word on each sticky note.

• Make a big concept map using the words.

• Each group will present its concept map.

Exit ticket

Exit ticket 2