Geoengineering is a real problem, and we need people talking about it. At this point, it's not theory; it's phenomenon. It's been widely documented (google is your friend) and analyzed. The NDAA explicitly permits the secretary of defense to conduct "any test or experiment involving the use of a chemical agent or biological agent on a civilian population" for "Any peaceful purpose that is related to a medical, therapeutic, pharmaceutical, agricultural, industrial, or research activity". See http://www.dod.mil/dodgc/olc/docs/1998NDAA.pdf, PDF page 287, section 1078 subsections (a) and (b). Now, subsection (c) states that informed consent from each human test subject is required, but they probably hired Bill Clinton to define "informed" and "consent" for them and determined that the subjects are informed when they see the chemtrails and consent by not moving.
What I'm still looking for is meaningful, actionable solutions. The closest thing I've found is this which describes various personal health supplements and defenses (starting at PDF page 38) including some scalar wave antenna stuff that supposedly pushes the toxins back out into space. I can't personally say that won't work, but I'm skeptical to say the least (if someone with more time and maker skills than me wants to try it, I'd love to hear about it).