I realize that Carl Sagan is dead and therefore needs no defense from me but W A Y   U P   T H E R E   I N   T H I S   T H R E A D, "Guest/Al" several times made the remark that Sagan had predicted that nuclear winter would follow the Gulf War oil well fires, and that therefore one could not trust "experts" opinions on global warming.

No one on this thread challenged the charge. The fact is that, wittingly or not, Guest/Al was wrong. I have found no such evidence that Sagan ever made such a prediction. Typical:

From Wiki

"Sagan erroneously predicted in January 1991 that so much smoke from the Kuwaiti oil fires "might get so high as to disrupt agriculture in much of South Asia…" He acknowledged the error in The Demon-Haunted World: "as events transpired, it was pitch black at noon and temperatures dropped 4–6 °C over the Persian Gulf, but not much smoke reached stratospheric altitudes and Asia was spared."