Chemtrails = conspiracy?

Link: http://www.thepetitionsite.com/7/investigate-persistent-contrails-aka-chemtrails

This is a quote from a petition published at PetitionSite February 4 2010:

'We the people, request an immediate, thorough, and honest investigation into what the substances labeled "chemtrails" actually consists of and to discover the true purpose of "chemtrail" operations in this country and across the globe. Such investigations must include independent, impartial experts, as well as individuals and groups.'