"The interior of this Sierra Club calendar is printed on paper containing a minimum of 50% recovered waste, of which at least 10% of the fiber content is postconsumer waste. The virgin component of the paper is chlorine free and entirely from tree farms."
The Sierra Club is offering TreeHugger readers who join their email action alerts and environmental news mailing list a free 2007 wall calendar (you can see what it looks like here - it's the "wall" model, click on it for the images). All you have to do is sign up here. There are 500 calendars, so the offer is valid while supplies last. While you're at it, check out the Sierra Club's blog, Compass.