Believers in chemtrails say those trails are actually clouds of chemicals used by the government for nefarious purposes. But as Carl Sagan says, “extraordinary claims require extraordinary proof”
WHAT ARE CHEMTRAILS?
Chemtrails, short for chemical trails, are what some call the white trails you see left behind as a plane passes overhead. Believers in the chemical aspect of chemtrails say those trails are actually clouds of chemicals used by the government or someother large scale entity for a variety of nefarious purposes from weather modification, to human population control via sterilization, to even mind control. The theories usually claim that normal jet plane output should dissipate quickly so any clouds that do not disappear immediately must be full of additional, undisclosed substances. Chemtrail theories are not only a U.S.-based phenomena—almost 17% of respondents in an international survey noted a belief in the existence of a "secret large scale atmospheric program" to be at least partly true.
To address this concern, a group of 77 scientists published a report in the journal of Environmental Research Letters after digging through the supposed evidence of the intent to poison us through chemtrails. These scientists are experts in atmospheric science, including the contributions of aircraft to the atmosphere as well as atmospheric processes like how quickly or uniformly chemicals fall through the air to the ground. Of those 77 scientists, 76 said they found no evidence of a "secret large-scale atmospheric program"—that’s 98.7%. Instead, they found that "the data cited as evidence [for such a program] could be explained through other factors, including well-understood physics and chemistry associated with aircraft." In other words, the evidence pointed to the trails being simply the normally expected result of planes flying through the air.
As for that one scientist? One scientist noted that in one remote location, the levels of barium in the atmosphere were unusually high relative to the levels of barium in the soil. No claims were made that the reason for those elevated levels had to be a large scale chemical operation, but since that scientist was not convinced of a clear reason for the barium to be higher in the atmosphere there, they left the possibility open.