I will show, that 2 central satements on Chemtrails are not likely to be true on the same time by analysing scientific data on 506 contrails in Alaska Fairbanks. http://akclimate.org/sites/default/files//papers/Wendler2005.pdf Common Chemtrail Believer Statements: 1)Chemtrails (long lasting lines >200 min) are not causal formed by surrounding conditions (RHi, Temperature) 2)Contrails can not be persisten (more than 200 minutes) Image from Paper: In this data, extremly long Contrails (>200 min) are only found in special Conditions. (Temperature, RHI) Thus this data suggest, only following cases (and some combination of those cases) are possible but only 5. seems to be likely. Statement 1 and 2 can be true on same time: +Chemtrails could exist 1.Data is not valid 2.Surroundings RHI 70 -80% * are much more common then the other one, and there is no causal connection between RHI and persisten Contrail or Chemtrail Statement 1 and 2 are not true on the same time: +Chemtrails does exist: 3.Chemtrails prefer to show under messured surroundings 4.There are persisten Contrails and Chemtrails, but no or little number of Chemtrails in the sense of Statement 1) is in the Data. +Chemtrails does not exist: 5.Persisten contrails form under special condition and are shown in the data. *Messured RHI with Radiosonds on low temperature need to be ajusted.