
World Trade Centerin terrori-iskun aikana USA:n lentoliikenne (n.60 000 lentoa päivässä) keskeytettiin ja tämä tarjosi tutkijoille ennennäkemättömän mahdollisuuden mitata lentoliikenteen aiheuttamien vesihöyryn tiivistysvanojen vaikutus lämpötilaan.
Lämpötila nousi noiden kolmen päivän aikana tuhansien mittausasemien datan mukaan 1,1 C-astetta,joka todistaa vesihöyryn vaikutuksen negatiiviseksi,kumoten erään alarmistien avainväitteistä.
LÄHDE
"This cooling effect of water vapor was proved following the 9-11 terrorist attacks. Atmospheric scientists studied the effect of water vapor on temperature in the wake of the attacks. The Federal Aviation Administration (FAA) prohibited commercial aviation over the United States for three days following the attacks and this presented a unique opportunity to study the temperature of the earth without airplanes and their contrails.
Dr. David Travis, an atmospheric scientist at the University of Wisconsin, along with two other scientists, looked at how temperatures for those three days compared to other days when planes were flying. They analyzed maximum and minimum temperature data from about 4,000 weather stations throughout the conterminous (48 states) United States for the period 1971–2000, and compared those to the conditions that prevailed during the three-day aircraft grounding period and the three days when planes were flying before and after the grounding period. This research effort was sponsored by grants from the National Science Foundation.
They found that the average daily temperature range between highs and lows was 1.1 degrees C higher during September 11-14 (shown graphically in Figure 2) compared to September 8-11 and September 14-17 with normal air traffic"