Here is another informed comment about past climate changes and their obvious lack of connection to the modern industrial era and the burning of fossil fuels.
jarxan Says: June 6th, 2007 at 3:13 pm
The climate is much more complex than current “public debate” suggests. Steady warming started in the early 1800s, well before “greenhouse gas” emissions were large. No one has yet explained the little ice age of the 15th century. Other earlier dramatic changes in climate are unexplained include (a) drouth the US southwest in the 1200-1400 period, (b) drouth in the Syrian area in the mid 1st millenium, (c) dramatic rainfall changes in southern India 5-6,000 years ago. I have been involved in computer simulations of complex physical systems for over 50 years and I am confident that NO ONE knows how to simulate the climate with high (even good) confidence for the next 50-100 years. Reducing greenhouse gases is a prudent step but no one should believe that it is THE cure for global warming.