If you're a believer in chemtrails, you may be wondering: What about the one scientist who found evidence? Maybe that person is the InfoWars version of Galileo, right?
Sorry to disappoint you, but no.
As the study clarifies: "The one participant who answered yes said the evidence s/he had come across was 'high levels of atmospheric barium in a remote area with standard 'low' soil barium'." That scientist stops short of absolutely ruling out the remote possibility that someone deliberately sprayed barium over that area, which is not the same as saying that it's the likely explanation. (As Bad Astronomy blogger Phil Plait explains, "When I can't find my keys in the morning I can't rule out that dinosaur ghosts hid them from me. It just seems a tad unlikely.")
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"The chemtrails conspiracy theory maps pretty closely to the origin and growth of the internet, where you can still find a number of websites that promote this particular brand of pseudoscience," study co-author Steven Davis, UCI associate professor of Earth system science, said in a UCI press release. "Our survey found little agreement in the scientific community with claims that the government, the military, airlines and others are colluding in a widespread, nefarious program to poison the planet from the skies."