The Attentive Heart: Conversations with Trees by Stephanie Kaza

People sometimes chuckle when they read the subtitle, but you have to read it to see why it's not a joke at all. Zen environmentalist Kaza spent quality time with a number of individual trees, meditating near them, getting to know them, and listening to their subtle messages. The result is this book of meditative essays on the environment that's like no other.