Infants absorb chemicals more easily than adults — their bodies run at a higher metabolic rate, and their skin is ten times thinner. Infant toys and teether made of PVC plastic often leak phthalates (pronounced “thay-lates”) and other toxic substances (see more details in this report on 2003 PVC Report Card on Kid’s Toys Manufacturers).
If done correctly, a very efficient form of heating. See this guide to efficient wood burning. See also woodheat.org.
A good place to find corner bookcases is Amazon. Ikea uses renewable materials to make their Billy Corner Bookcases: Renewable raw material (chips). Renewable raw material (wood fibers). The product is tested for formaldehyde according to European standard. Possible to separate for material or energy recovery. Available from Ikea: Ikea “Billy” Corner Bookcase ($80).