Shop for "The scientist claims that the two most common substances being sprayed into chemtrails are aluminium oxide and barium stearate. When you see planes flying back and forth marking parallel lines, X-patterns and grids in a clear sky, thats aluminium oxide, according to the scientist. The goal is to create an artificial sunscreen to reflect solar radiation back into space to alleviate global warming. In some cases, barium may be sprayed in a similar manner for the purpose of high-tech 3-D radar imaging. (Columbus Alive Dec. 6, 2001)