1. Greenhouse Gases: Changing the Climate

2. As we learned, Greenhouse Gases have been part of our atmosphere for millions of years.
However, over the past 200 years the amount of gases has increased dramatically.

3. Anthropogenic Greenhouse Gases
Additional amount of human-produced greenhouse gases

4. Concentration of Greenhouse Gases
Concentration in the Atmosphere
Pre-Industrial
Level
2008
Increase
Lifetime
(years)
carbon dioxide
280 ppm
384 ppm
1.4x
100 to 1000
methane
0.7
1.785
2.6x 12
nitrous oxide
0.27
0.321
1.2x
114
CFC-11
trace 45
CFC-12
100

5. Summary of Anthropogenic Greenhouse Gases
Natural Source
Man-made Sources
carbon dioxide
volcanic eruptions
burning of organic matter
cellular respiration
burning fossil fuels
methane
plant decomposition
animal digestion
agricultural activities
landfills and sewage treatment
coal mining, natural gas extraction
deforestation
nitrous oxide
reactions of bacteria in soil and water
livestock feed and waste
fertilizers
industrial processes
CFC’s
no natural sources
refrigeration agents
aerosol cans

6. Anthropogenic Greenhouse Gases and Global Temperature

7. Feedback Loop Between Carbon Dioxide and Global Temperature
More carbon dioxide is released from carbon sinks
Carbon dioxide traps thermal energy in greenhouse effect
Global temperature increases

8. Increases to Earth’s Average Temperature
The anthropogenic greenhouse effect is causing Earth’s temperature to increase
Earth’s average temperature will likely increase by 2°C to 6°C by the end of the century if things do not change
Consequences of this could be severe heat waves, flooding and droughts, and species extinction

9. Map of the World

10. Remapping the World Based on Population

11. Remapping the World Based on Greenhouse Gas Emissions

12. Canadian Emissions of Greenhouse Gases
Canada has < 1% of the world’s population, but contributes about 2% of the world’s greenhouse gas emissions
Read Pg. 390 – 392 Make a summary note by copying out the In Summary Section. Answer pg. 392 #1-4