1. 14.4 The Human Factor
SWBAT compare and contrast the greenhouse effect and global warming; identify how humans impact climate

2. The Human Factor Earth receives energy from 2 sources” Sun Atmosphere
Direct solar radiation
Atmosphere
Reflected solar energy stored in gases
Carbon Dioxide
Methane
Water vapor

3. The Greenhouse Effect Greenhouse effect
Retention of heat by the atmosphere
Natural process caused by certain gases in the atmosphere (greenhouse gases)

4. The Greenhouse Effect Global warming
A rise in global temperatures caused by an increase in greenhouse gases (especially carbon dioxide) which traps heat

5. Global Warming Increased temperatures could lead to”
Polar ice caps melting
Sea levels rising
Flooding of coastal areas
Deserts spreading
Severe thunderstorms increasing

6. Global Warming
Scientists agree that global warming is happening, but disagree as to the cause
Natural changes (earth’s tilt, wobble, etc.)
Increased carbon dioxide
Where does it come from?
What can be done to stop it?

7. Impact of Human Activities
Increased carbon dioxide levels could be from:
Automobiles
Exhaust
Burning fossil fuels
Deforestation
Mass removal of trees
Photosynthesis uses CO2

8. Environmental Efforts
To reduce environmental impact:
Conserve energy
Turn off appliances
Turn off lights
Turn down thermostat in winter
Recycle
Reduce fossil fuel use

9. With a partner Answer questions 1-5 on page 377 in complete sentences
Finish for homework