Questions about climate change

Yesternight I listened to a very basic talk by a climate expert, one who's been measuring and coordinating meetings and compiling the science and putting the information out there for all to see and for govts to act upon.
I asked "how many trees per person", and really sensed there was a reliance on government response. Our #OneHotPotato idea on twitter was dismissed as "nice" (it's intended to make people just smile).
Climate analogs should give us which trees. Huge distributed computer power, with global and local models, should give us the tree element of the equation. If it's 100 trees per person, I'd plan mine in a couple of months and move on to help others.
So, again: which trees and how many?