Dr Dave's graphs, the linked ones that is, do indeed show a possible link between CO2/T in the fluctuations over 250,000 years.
However what is missing are graphs over the same period linking CO2/T/Airliners/human activity.
The graphs do not of course explain conclusively whether CO2 increases are caused by increased T, through the effect on lifeforms and the capacity of water to hold CO2, or whether the increase in CO2 from some source causes the increases in T.
As some have pointed out the sun's fluctuations, and our varying distance from the sun , are the prime source for climate change, and in its own small way this European summer, linking with a recent double top in solar activity, and the recent increase in the same in June/July tend to back up this proposition.
That said, contrails and aircraft high altitude emissions, which may not get recycled into the lower atmosphere, should be studied.
Afterall, human activity did cause London smog and cholera outbreaks. Not Linked though, except as human activity.
Last edited by bluskis; 8th Aug 2003 at 02:23.