Quote:
Originally Posted by Norm Peterson
Not a disagreement, just a question . . . since science wasn't around millions of years ago, how well can we know how accurate that the obvious extrapolations might be?
Norm
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This is what I found, again , nasa.gov
When scientists focus on climate from before the past 100-150 years, they use records from physical, chemical and biological materials preserved within the geologic record. Organisms (such as diatoms, forams and coral) can serve as useful climate proxies. Other proxies include ice cores, tree rings, and sediment cores. Chemical proxy records include isotope ratios, elemental analyses, biomarkers and biogenic silica. Taken together, these proxies extend our knowledge of past climate back hundreds of millions of years into the past