Global warming is the increase in average temperatures of the Earth's atmosphere and oceans due to greenhouse gas emissions. It began in the mid-20th century and is evidenced by rising global temperatures, shrinking glaciers, and declining Arctic sea ice. The main cause is the burning of fossil fuels like coal, oil and gas which release carbon dioxide and other greenhouse gases into the atmosphere. If unchecked, global warming will have severe environmental, social and economic consequences around the world.

1. Environmental issues

2. Global warming
• What is global warming?
-the increase in the average temperature of the
Earth's near-surface air and oceans since the
mid-20th century and its projected
continuation

3. How Global Warming Happens?
Carbon Dioxide (CO2)
Fossil fuels (coal, oil, natural gas)

4. Effects of Global Warming

5. What’s the proof that
global warming is taking
place?

6. Portage Glacier
Alaska
1914 2004
Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org

7. Colorado River
Arizona
June 2002 Dec 2003

8. Why is global warming
happening?

9. Burning of Fossil Fuels
Pollution from coal,
natural gas, and oil

10. When did global
warming start?

11. Global Atmospheric Concentration of CO2

12. How is global warming
measured?

15. What is green house effect?

16. What is a green house?
• A greenhouse is a structure with a glass or plastic
roof and frequently glass or plastic walls; it heats
up because incoming solar radiation from the sun
warms plants, soil, and other things inside the
building faster than heat can escape the
structure.
• Air warmed by the heat from hot interior surfaces
is retained in the building by the roof and wall.
These structures range in size from small sheds to
very large buildings.
Green house effects

17. Example of the
Greenhouse Effect
The Sun’s energy
passes through the
car’s windshield.
This energy (heat)
is trapped inside
the car and cannot
pass back through
the windshield,
causing the inside
of the car to warm
up.

18. Others environmental issues

19. Reference
http://www.globalstewards.org/issues.htm
http://www.globalissues.org/article/171/loss-of-biodiversity-and-extinctions
http://en.wikipedia.org/wiki/Thermal_pollution
http://environment.about.com/cs/a.htm
http://environment.about.com/
http://www.offshore-environment.com/articles.html
http://en.wikipedia.org/wiki/Greenhouse