Originally posted by WTFH
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Since c400AD - high resolution proxies, mainly tree rings, also lake deposits, corals.
c800K years - Low resolution proxies - ice cores.
The long-dated proxies show that for at least 800K years CO2 and temperature have oscillated in a range, (between approx 180 and 280ppm for CO2) as the planet went through glacial / interglacial phases. CO2 is now approx 40% above that range.
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