H2Andy:whatever their effect, for millennia the Earth was able to handle all the volcanos and fires in it
then, in a matter of a few decades COINCIDENTAL WITH MAN'S INDUSTRIAL ACTIVITY
it all goes haywire...
doesn't it at least make you go... hmmmmm......?
It makes me go hmmmm. I'm not a global warming alarmist but not in denial either. I just think it's possible there are other factors in play, and that short-term cycles (even a millenium is short term) are often not indicative of long term trends.
For example, do we know for a fact that the earth isn't being warmed by other sources, perhaps an increase in solar heat or increase in heat from the core? All it would take is a degree or two over several millenia, until you reach a trigger point and get a runaway cycle.
Venus became a steamy hellhole and Mars became a frozen desert and I'm pretty sure it wasn't due to man's industrial activity.