"Newps" wrote in message
...


Dean Wilkinson wrote:
So, lets look at this factually...

In recent history, atmospheric CO2 levels have been at their lowest
levels
in the entire history of the planet.

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.
There are other geologic indicators that they use to determine the levels as
well for prehistoric data.

It has been as low as about 150 ppm.
In recent history, it has been steadily climbing toward 300 ppm,
presumably
due to human activity, but there has been a fair amount of volcanic
activity
in recent years which also contributes large amounts of CO2.

It's a guess. We only have maybe 150 years of temp data and much less
years of other data. In the history of the planet that is zip.

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



Also, historical global temperature data shows that the earth has a
bi-stable average temperature (bouncing between 12C and 22C). The
average
temperature of the earth is currently at the low bi-stable point, but
throughout most of the earths history, the temperature was at the high
bistable point. The last time that the earth had the current
combination of
low CO2 and low average temperature was about 300 million years ago.

The earth has cooled and warmed constantly. Glaciers come and go.
Humans couldn't change that if they wanted.