Nobel Peace Prize laureate Wangari Maathai is a celebrated environmentalist, the founder of the Green Belt Movement, an environmental group that has restored indigenous forests and assisted rural women by paying them to plant trees in their communities. Since 1977, the movement has planted more than 30 million trees and been replicated in dozens of African countries. Her new memoir, Unbowed, will be available for signing.

Tickets may be purchased either at the door or on line at AMNH.COM ($13.50 Members, students, senior citizens, all others $15).