Dean Wilkinson wrote:


You have no way of knowing that. I can just see the caveman out there
with his CO2 test kit.....



Actually, we do know this with a fair degree of confidence. Antarctica has
trapped bubbles of air going way back in its ice that has been core sampled.

Would that be before, during or after the volcanic eruption? While
interesting, trapped air doesn't tell us much of anything. We can't
even affix a date to within a reasonable amount of time.




There are other geological records that are used to determine temperature
besides direct measurements.


Yes, but today we know what the temp is every hour of every day.
Looking at rocks we only have generalities. It was hot during this
period of years, cold during this period, etc. Now we're trying to say
that because the temp has gone up 1 degree in the last 50 years we have
a problem.