Did you know…

The electric eel of South America (Electrophorus electricus) can generate over 600 volts & can even paralyze a horse.

The normal energy used by our brain is 0.1 calories per min, & could go up to 1.5 during activities such as puzzle-solving.

1. True/False. The ozone layer is a positive thing b/c it blocks harmful UV light from reaching Earth’s surface.

2. What causes global warming? (Choose all that apply)

A. Depleting the ozone C. Reducing air pollutionB. Releasing carbon dioxide D. Deforestation

3. What is the Greenhouse Effect?4. True/False. Traditional agriculture is better for

the environment than organic agriculture.5. What is deforestation?

Average weather patterns for entire globe

Climate change (temp, precip, wind, etc.) occurs over extremely long time periods

◦ During average human life, climates won’t significantly change

O3 molecules In stratosphere

◦ 20 - 30 km (12 - 19 mi) above Earth’s surface

Shields life from harmful ultraviolet (UV) light from Sun

Easily depleted by free radicals

Greenhouse gases in atmosphere trap Sun’s energy ◦ Water vapor (H2O)

◦ Carbon dioxide (CO2)

◦ Nitrous oxide (N2O)

◦ Methane (CH4) Pro: traps heat to keep Earth warm

◦ W/o these gases Earth’s temp would be 60ºF colder Con: too many gases = too much heat

(global warming)

Earth's average temp incr 1.4°F over past century

Will rise 2-11.5°F over next hundred yrs

Small changes in average temp = large/dangerous climate shifts

http://www.youtube.com/watch?v=oJAbATJCugs

1. http://www.youtube.com/watch?v=2_ZQRIsn2pA&feature=relmfu

2. http://www.youtube.com/watch?v=P-0_gDXqYeQ&NR=1&feature=fvwp

3. http://www.youtube.com/watch?v=6rdLu7wiZOE&NR=1&feature=fvwp

4. http://www.youtube.com/watch?v=skFrR3g4BRQ&NR=1&feature=fvwp

5. http://www.youtube.com/watch?v=7nRf2RTqANg&NR=1&feature=fvwp

6. http://www.youtube.com/watch?v=O8qmaAMK4cM&NR=1&feature=fvwp