2. CAUSES & THREATS OF GREEN HOUSE EFFECT

5. The heated surface emits infrared light.

6. The majority of Earth’s atmosphere (N2 and O2) are not good greenhouse gas.

8. incoming radiation infrared radiation Earth’s surface warms, emits radiation

9. incoming radiation greenhouse gases infrared radiation Greenhouse gases absorb IR leaving the surface

10. incoming radiation greenhouse gases infrared radiation Gases are energized, then emit radiation (IR)

11. incoming radiation greenhouse gases infrared radiation Some of this IR reaches the planet surface, warming it further

13. Methane (CH4)

15. b

18. Because water vapor is a strong greenhouse gas, the increase in H2O vapor in turn causes enhanced greenhouse effect, raising the temperature more.

19. Higher atmospheric temperature will cause more evaporation of water

20. Which leads to even higher temperature…Runaway Green House Effect!

21. Climate models suggest that the changes are just beginning now and will accelerate.

22. Arctic Ice Melting Faster Than Predicted

23. CLIMATECHANGE

26. CO2 – Carbon Dioxide

27. CH4 – methane

30. Deforestation

32. That means reduce or eliminate use of fossil fuels to limit damage in the future.

33. Alternative energy sources such as wind, solar, geothermal, and tidal are needed.

34. Increase forest cover.

35. Sequester (remove) carbon from the atmosphere.

37. Runaway Greenhouse Effect If we were to move the Earth closer to the Sun, like where Venus is now, then we would suffer the runaway greenhouse effect as well, lose all the water, and become hot like Venus.

38. Other planets also have Greenhouse Effects, but these are unsuitable for life Venus Atmosphere: mass 90x earth’s GH Gases: >90% CO2 Sfc. Temp.: 477C GH Effect: 523C FAR TOO HOT! Earth GH Gases: ~0.04% CO2 ~ 1% H2O Sfc. Temp.: 15C GH Effect: 33C NOT BAD! Atmosphere: mass <1% earth’s GH Gases: >80% CO2 Sfc. Temp.: -47C GH Effect: 10C FAR TOO COLD! Mars Sun

39. SUMMARY Greenhouse gases absorb infrared radiation and prevent it from escaping to space. Carbon dioxide, methane, and nitrous oxide are very good At capturing energy at wavelengths that other compounds

40. THANK YOU!!! BY: PRANAY RAJPUT%X B