Coexistence among human beings can become more than bumper sticker sentiment if readers take the ideas in this book seriously. TRI WORLDS It's Time to Think as a Species challenges individuals, and nations, to begin the transition to a new mindset focused on species survival and planetary integrity. We need to question the value of fractional identities (nations, ethnicities, races, religions) that deny the importance of the wholes - our species and the planet. Albert Einstein and Bertrand Russell said in their anti-nuclear manifesto: 'Remember your humanity, and forget the rest'. This book proposes ways for our species to mature so humanity can exist peacefully and nature can continue to sustain us. You - the individual - are the key.