I want to respond to a bunch of different replies and most of them are scatterd out, so this will probably be a little sketchy
Other than the diesel and office contents reply, nobody else responded to this one. And even if a pool of diesel and a mountain plastics were wrapped around the main support beams they still wouldn't have created enough heat for the beams to suddenly fail the way they did. Since the entire building falls at an equal and level rate, wouldn't the majority of the main support beams have to had fail at the same exact time?
If one or two beams became heated enough to fail then it could have possibly created a domino effect, but from ALL of the video's available for viewing... it certainly doesn't appear that way.
According to this picture:
http://www.whatreallyhappened.com/fema/fig-5-16.jpg
none of this damage would have played a role in destroying the structural steel foundation of the building.
Supposedly, 20,000 gallons where recovered intact from the two 12,000-gallon tanks, so only 4,000 gallons could contributed to the heat , if by some chance the tanks were completely full.
I've done a little more than look at YOUTUBE and I don't appreciate being called an idiot.
I haven't seen where anybody describes or claims that fire appeared on the ground or basement floors, and since that's where the they would have been placed considering the descent of the structure.. the WOULD have survived since there was no fires reported on those floors.
There were relatively small fires throughout the building during the 7 hours prior to it's collapse, but none of the images I've seen show more than one or two floors burning on any side of the building at the same time.
The building didn't burn, according to the images and reports a very small portion of the buildings contents burned.
I think we can all agree that the structural integrity of the steel beams failed "suddenly". Non heat treated steel loses about half of it's strength at about 600C. Let's say that there were 12 magicians at the base of each beam with a oxycetylene torch, that still wouldn't have caused the building to collapse the way it did. According to ALL of the video's available, the entire foundation of the structure basically "vanished" simultaneously.
...
Back to my first question, what contents of an office building could have provided enough fuel to maintain the heat required to melt steel?