Are they Human or Natural?<br />Are they Cooling or Warming?<br />Causes of climate change<br />
The earth’s rotation and orbit	<br />As the earth orbits the sun, it wobbles slightly on its axis. These “wobbles” are nam...
El Nino<br />Occurs in the Pacific Ocean, where the normal circulation slows, stops and reverses. <br />This causes the su...
Ice albedo effect<br />Ice and snow (being white) reflect incoming solar radiation. Albedo means reflectivity.<br />Where ...
Deforestation of Tropical Rainforests<br />Tropical rainforest is a natural carbon sink (it absorbs a massive amount of ca...
Fossil fuel burning	<br />Burning fossil fuels releases large quantities of CO2 into the atmosphere causing the enhanced g...
Deforestation of boreal (conifer) forest (in Siberia and Northern Canada)<br />When forest is cleared in the far north it ...
Volcanic activity<br />Large volcanic eruptions create huge quantities of particles which encircle the earth in the upper ...
La Nina<br />Occurs after El Nino. The Pacific circulation restarts, stronger than usual, this means that the surface wate...
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Causes Of Climate Change

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Climate Change Causes for AS students

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Causes Of Climate Change

  1. 1. Are they Human or Natural?<br />Are they Cooling or Warming?<br />Causes of climate change<br />
  2. 2. The earth’s rotation and orbit <br />As the earth orbits the sun, it wobbles slightly on its axis. These “wobbles” are named after Milankovitch who discovered them.<br />In the past the Milankovitch cycles have coincided with ice ages.<br />http://www.wwnorton.com/college/geo/egeo/flash/18_2.swf<br />Natural<br />Human<br />Cooling<br />Warming<br />
  3. 3. El Nino<br />Occurs in the Pacific Ocean, where the normal circulation slows, stops and reverses. <br />This causes the surface of the ocean to become warmer and causes significant changes in the weather patterns around the Pacific and globally<br />Natural<br />Human<br />Cooling<br />Warming<br />
  4. 4. Ice albedo effect<br />Ice and snow (being white) reflect incoming solar radiation. Albedo means reflectivity.<br />Where there is a lot of ice it reflects enough energy to reduce global temperature <br />http://svs.gsfc.nasa.gov/vis/a010000/a010000/a010021/a010021_H264_640x480.mp4<br />Natural<br />Human<br />Cooling<br />Warming<br />
  5. 5. Deforestation of Tropical Rainforests<br />Tropical rainforest is a natural carbon sink (it absorbs a massive amount of carbon from the atmosphere), reducing CO2 levels.<br />Evaporation from the Tropical Rainforest is very high and this causes clouds to form which reflect the sun’s energy<br />When the rainforest is removed less CO2 is absorbed and less clouds form.<br />Natural<br />Human<br />Cooling<br />Warming<br />
  6. 6. Fossil fuel burning <br />Burning fossil fuels releases large quantities of CO2 into the atmosphere causing the enhanced greenhouse effect.<br />Natural<br />Human<br />Cooling<br />Warming<br />
  7. 7. Deforestation of boreal (conifer) forest (in Siberia and Northern Canada)<br />When forest is cleared in the far north it increases the albedo (reflectivity) of the earth because the forest is dark in colour and snow stays longer on the ground<br />Natural<br />Human<br />Cooling<br />Warming<br />
  8. 8. Volcanic activity<br />Large volcanic eruptions create huge quantities of particles which encircle the earth in the upper atmosphere. <br />These reflect radiation and shade the earth for up to 5 years.<br />Natural<br />Human<br />Cooling<br />Warming<br />
  9. 9. La Nina<br />Occurs after El Nino. The Pacific circulation restarts, stronger than usual, this means that the surface waters have less time exposed to the sun, and to warm up.<br />The ocean surface is cooler.<br />Natural<br />Human<br />Cooling<br />Warming<br />
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