Quote:
Originally Posted by Angst
We have ice core samples go back at least 120,000 years. Hardly second hand data.
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What do ice cores show? O2/CO2 levels, pollen (but no way to be certain where the pollen came from, dust (the same), isotope changes, and level of precipitation at that location. Maybe SO2 spikes. That's all.
No direct solar activity measures, (sunspots, solar storms hitting the earth).
No average cloud cover data.
No direct measure of temperature, either local or as a world wide pattern.
No world-wide rainfall patterns.
These are the detailed data that are needed to be able to limit the background variances (which are large) to say how much of the temperature rise in the last century is due to extra CO2 being pumped into the atmosphere.