There are two types of evidence for climate change; short term and long term
Long term evidence
Ice cores
•Scientists can drill ice cores from Antarctica and Greenland •Air bubbles from these ice cores can be analysed, with oxygen and C02 levels studied •Oxygen and C02 levels inform us about the earth’s past temperature •This has created a record going back 800,000 years •The current concentration of CO2 is the highest on record 384 ppm |
Pollen analysis
•Scientists drill sediment cores from peat bogs •Pollen grains are preserved in the waterlogged sediments •Different pollen grains come from different trees, some which live in colder conditions, some which live in warmer conditions •E.g. Birch trees live in colder conditions |
Short term evidence
Glacier Retreat
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Seasonal Changes
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Dendrochronology
(Tree Rings)
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Rising Sea Levels
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