Here are just a few resources highlighted :
http://www.publications.parliament.uk/pa/cm200910/cmselect/cmsctech/221/221.pdf
http://www.geoengineeringwatch.org/wp-content/uploads/2013/01/R41371.pdf
http://www.cfr.org/projects/world/geoengineering-workshop-on-unilateral-planetary-scale-geoengineering/pr1364
http://www.theguardian.com/environment/2012/oct/15/pacific-iron-fertilisation-geoengineering
http://www.imo.org/MediaCentre/PressBriefings/Pages/47-ocean-fertilisation.aspx
http://www.theguardian.com/environment/2012/feb/06/bill-gates-climate-scientists-geoengineering
http://news.cnet.com/8301-11128_3-10218083-54.html
http://acrf-campaign.arm.gov/isdac/
http://truthstreammedia.com/cia-funds-630000-global-climate-control-study-chemtrails-anyone/
http://in.reuters.com/article/2012/08/30/climate-sunshade-idINDEE87T0K420120830
See also:
What in the World Are They Spraying?
What in the World Are They Spraying? (Full Length)
Why in the World Are they Spraying?
"Why in the World are They Spraying?"
Aaron Dykes on Chemtrail/Geoengineering Agenda