Each of those Worlds is as real as ours and every one of them is a succession of incidents, events, occurrences which influence its future.
Countless Worlds, numberless moments, an immensity of space and time.
And our small planet at this moment, here we face a critical branch point in history.
What we do with our world, right now, will propagate down through the centuries and powerfully affect the destiny of our descendants.
It is well within our power to destroy our civilization and perhaps our species as well.
If we capitulate to superstition or greed or stupidity we could plunge our World into a time of darkness deeper than the time between the collapse of classical civilisation and the Italian Renaissance.
But we are also capable of using our compassion and our intelligence, our technology and our wealth to make an abundant and meaningful life for every inhabitant of this planet.
To enhance enourmsly our understanding of the universe and to carry us to the stars.
Historians in a thousand years from now will look back on our time as being absolutely critical, a turning point, a branch point in Human history.
Because if we survive, then this time will be remembered as the time when we could have destroyed ourselves and came to our senses and did not.
The life on it is real, and the political separations that have placed the planet in danger are of Human manufacture. All the beings on this little World are mutually dependent. It is like living in a lifeboat.
We breathe the air that Russians have breathed, and Americans and Chinese and people all over the planet.
Whatever the causes that divide us is clear that the Earth will be here a thousand or a million years from now. The question, the key question, the central question, the only questions is, will we?