This, ironically, was posted on Russ Tanner's Chemtrails Global Skywatch Facebook Page. The first big idea, copying a volcano, would be chemtrails geoengineering with sulfur dioxide instead of metals. The article points out that this is not technically feasible at this time because we don't have any planes that can operate in the stratosphere, except small fighter planes, which could not deposit significant amounts of material. I pointed this out on the forum, and have since been banned from that page. I can't even open and view it.
I'm not sure if this is the current issue of Popular Mechanics or a little older. The volcano photo is dated 2009.