Hello - my nonfiction is an outgrowth of the fact that I'm a geologist - it relates to U.S. dependency on minerals for everyday things, an import dependency greater in many cases than the well-publicized foreign dependence on oil imports.
Also, why are you writing nonfiction? Is it to change the world, make money and be famous...tell Dr. Phil what's up with a 200 page slap down?
It's to increase awareness - no illusions of changing the world... and to make
some money. And I thoroughly enjoy both the research and the craft of trying to popularize science.
On the business side - what are your thoughts on having a nonfiction proposal submitted for an unfinished project? One agency actually prefers this, and while I can see it having some value, I'm not sure I totally agree. Your thoughts/experiences?
Whether correct or not, my perception has been that publishers (at least for unpublished people like me) want to have the possibility of some kind of control - if they see something that is a good idea, well written, by someone with a platform, but that could use some different spin to be more marketable, they'd like the book to be not quite done so they could have that kind of influence - maybe. I accept that. I actually have about two-thirds of the book in virtually final draft (as far as I'm concerned, at least), with three sample chapters as polished as possible so that when I query agents (soon, I hope) I'm ready with the full proposal. I've left four chapters unfinished pending what an agent may say and then, I hope, what a publisher may say. It will be pretty easy to tweak the existing chapters to change the spin - there really are not too many ways you could spin it - but two of the unfinished chapters lend themselves to a couple approaches that I can imagine a publisher preferring one or the other.