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Why does climate change?
LONG TERM:  The Earth’s orbit around the sun changes from circular to elliptical and back over about 100,000 years. ,[object Object],[object Object]
The Earth is tilted on its axis – the angle of tilt changes (41,000 year cycle) – and it also wobbles about (26,000 year cycle)! ,[object Object],[object Object]
MEDIUM TERM:  Cycles of sunspot activity cause variable solar output over a few hyndred years ,[object Object]
This graph suggests that sunspot activity might be a factor in temperature change  (– but be careful – graph only covers a short period of time)
SHORT TERM:  Volcanic eruptions can send ash particles & gases many kms into the atmosphere – blocking out the sun’s rays.  Mount Pinatubo, Philippines, eruption June 1991, led to a fall in average global temperatures of 0.5 degree C. However, the effect is likely to be for a few months or years only. ,[object Object]
Tambora, Indonesia, 1815 – the biggest known eruption in human history - ,[object Object],[object Object]
Since the 1850s, there has been a rapid rise in temperatures – and human activities are being blamed for this… but that’s the next instalment!

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Why Does Climate Change

  • 2.
  • 3.
  • 4.
  • 5. This graph suggests that sunspot activity might be a factor in temperature change (– but be careful – graph only covers a short period of time)
  • 6.
  • 7.
  • 8. Since the 1850s, there has been a rapid rise in temperatures – and human activities are being blamed for this… but that’s the next instalment!