From: "Geo" 

"Monte Davis"  wrote in message
news:of9bp1tphrcns05shh9kc1lluno3m21kt5{at}4ax.com...

> It's a tradeoff: whether in sea level or temperature, you get clearer
> "signal" from the larger changes over longer periods -- but OTOH you
> have many many more data points for recent periods, which strengthens
> confidence in detecting small changes. I give the latter more weight.

Hasn't anyone measured the CO2 levels over the past 20 years to see if
there is a measurable change planet wide?

Geo.

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