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LONG TERM (GEOLOGICAL)
· The cycle of ice ages which began around
450,000 years ago (C02 level ice age-
180ppm)
· Ice ages occurred at almost regular intervals
in the geological period known as the
quaternary period…read more

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INTERGLACIALS
· The warmer periods in between ice ages
· C02 levels about 280ppm (higher than ice
ages)…read more

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EVIDENCE FOR LONG TERM CLIMATE
CHANGE
· Ice cores in the Greenland and Antarctic ice
sheets
· Air is sampled from bubbles trapped in the
ice and C02 levels are reconstructed
· Pollen extracted from peat bogs (preserved
in peat)
· Different shaped pollen shows different type
trees
· Some trees are suited to certain
temperatures…read more

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THE WEAKNESS OF LONG TERM
EVIDENCE
· Long sequences are rare
· Evidence is mostly incomplete…read more

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MEDIUM TERM CLIMATE CHANGE
(HISTORICAL)
· Between AD 1000 and 1850- no direct
evidence
· Proxy records
Painting
s
Picture
s
Diarie
s
Poem
s…read more

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