Chemtrails: another source of pollution

Once upon a time, the only contrails in the sky were thin lines, high in the air, that quickly disappeared. These contrails form when the warm vapor trail produced by airplane engines meets the cold air found at high altitudes, over 30,000 feet. Since the early 1990s, a different type of vapor trail has become commonplace in the US, Canada, England, and Spain. These chemtrails, reportedly emitted from unmarked air force tankers, typically create varying patterns of Xs, grids, and parallel lines. They look like regular contrails at first but quickly expand in width instead of disappearing. Eventually, they spread across the sky, forming a thin, white veil or 'fake cirrus-type cloud' that remains for hours.

Eyewitnesses report respiratory problems and other physical complaints after being exposed to chemtrails. Unlike regular contrails, these formations can appear during warm, dry conditions--an impossibility...