We depend upon free inquiry and free access to knowledge. We humans have seen the atoms which constitute all of nature and the forces that sculpted this work and others. We have found that the molecules of life are easily formed under conditions throughout the cosmos. We have mapped the molecular machines of the heart of life. We have discovered a microcosm in a drop of water; we have peered into the bloodstream and down on the stormy planet to see the earth as a single organism. We have found volcanoes on other worlds and explosions on the sun, studied comets from the depths of space and traced their origins and destinies; listened to pulsars and searched for other civilizations.

We humans have set foot on another world in a place called the Sea of Tranquility, an astonishing achievement for creatures such as we, whose earliest footsteps three and one-half million years old are preserved in the volcanic ash of east Africa. We have walked far.

These are some of the things that hydrogen atoms do given fifteen billion years of cosmic evolution. It has the sound of epic myth, but it is simply a description of the evolution of the cosmos as revealed by science in our time. And we, we who embody the local eyes and ears and thoughts and feelings of the cosmos, we have begun at least to wonder about our origins — star stuff contemplating the stars, organized collections of ten billion billion billion atoms, contemplating the evolution of nature, tracing that long path by which it arrived at consciousness here on the planet earth, and perhaps throughout the cosmos.

Our loyalties are to the species and to the planet. We speak for earth. Our obligation to survive and flourish is owed not just to ourselves but also to that cosmos ancient and vast from which we spring!

Who Speaks for Earth
Carl Sagan