Climate Change - How do we know what it was like long ago?. Tree rings - thicker rings in warm/wet springs - thinner in cool/dry years Rings can be counted from fallen logs Climate records for up to 1000 years. Christmas Tree – 17 years old – cut down Dec 2009.
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- How do we know what it was like long ago?
Tree taken from West Carleton ~ 5 km from Stittsville
These bubbles are the air of ½ million years ago! rings analyzed
Growth rings in coral
Often, climate scientists put their data together from all sources to look for similarities and correlation