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[Rob <becida AT comcast.net>]

I'm not sure about the bias but I did find this one:
http://www.co2science.org/scripts/CO2ScienceB2C/subject/l/summaries/usalia.jsp

They found a cycle rise & lowering of temps by studying fossilized oyster 
beds.
>>These findings are but one more example of the reality of both the 
Medieval Warm Period and the Little Ice Age, which are the two 
preeminent climatic anomalies of the past thousand years.  Their 
significance resides in the fact that the earth cycles back and forth 
between warm and cool periods (of which these named intervals are 
typical) on a millennial timescale, which suggests there is nothing 
unusual about the global warming of the past century or so, as it 
represents the planet's natural recovery from the global chill of the 
Little Ice Age and the start of its return to Medieval Warm 
Period-like conditions.<<

Rob

At  1/1/2006 04:25 PM,Tracy wrote:
> I have been trying to find info on this myself and keep getting biased
> sounding material.  I found this graph at several sites.  It seems to have
> the only seemingly unbiased, long term data on temp and CO2.  Sure looks
> cyclic to me.  Looks like we will be headed for a cool spell in the not to
> distant future, give or take 1000 years.  I "lost" another site, but it
> superimposed a particulate graph onto the temp/CO2 graph and that showed the
> temps dropping when the particulates were high.  Makes sense.
>
> http://www.grida.no/climate/vital/02.htm
>
> Tracy Julian
> in East North-Central Minnesota