Changes

Black smoke was seen coming out of WTC7 and other places on 9/11. A common conspiracy theory says that black smoke means that a fire is starved of oxygen, and therefore can easily be put out. It is said that the firefighters did not attempt to put out the fire, in this case. In the past, this might have been true, but petroleum burns very hot and is difficult to put out, and yet it also gives off black smoke. There was a large amount of [[diesel fuel]] in Building 7, which was used for running backup [[diesel generators]] in case of a power outage. Also, all three buildings contained large amounts of [[plastics]], which can also burn very hot and be difficult to put out, yet give off dark-colored (and highly toxic) smoke.