Quote:
Originally Posted by crash
Didn’t know there were people with thermometers here 5000 years ago. It is hotter in the time of recorded temperatures maybe 200 years.
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Prior to modern day instruments, we have many different method of obtaining past climate information -- everything from temperature to the amount of oxygen, CO2 and many other elements in the air and land and ocean. These are called proxies - which include radio-carbon dating. We have numerous proxies telling up earth was much warmer many times in the past when CO2 levels were much lower. See image for a good example -- where none of the climate models can replicate -- which is more evidence they all fail.