We have heard the rationales offered by the nuclear superpowers. We know who speaks for the nations. But who speaks for the human species? Who speaks for Earth? | Carl Sagan quote HD Wallpaper

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We have heard the rationales offered by the nuclear superpowers. We know who speaks for the nations. But who speaks for the human species? Who speaks for Earth? (Carl Sagan)

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Nuclear power plant cooling towers emitting smoke

What is chastity? How shall a man know if he is chaste? He shall not know it. We have heard of this virtue, but we know not what it is. | Henry David Thoreau quote

The prediction of nuclear winter is drawn not, of course, from any direct experience with the consequences of global nuclear war, but rather from an investigation of the governing physics. | Carl Sagan quote

Accommodation to change, the thoughtful pursuit of alternative futures are keys to the survival of civilization and perhaps of the human species. | Carl Sagan quote

The nuclear arms race is like two sworn enemies standing waist deep in gasoline, one with three matches, the other with five. | Carl Sagan quote

If the greenhouse effect is a blanket in which we wrap ourselves to keep warm, nuclear winter kicks the blanket off. | Carl Sagan quote

The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself. | Carl Sagan quote

We on Earth have just awakened to the great oceans of space and time from which we have emerged. | Carl Sagan quote

We have heard the rationales offered by the nuclear superpowers. We know who speaks for the nations. But who speaks for the human species? Who speaks for Earth? | Carl Sagan quote HD Wallpaper

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