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!

Why Does Climate Change

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