Space exploration is essential for humanity to survive. Earth has been polluted beyond repair. Climate change is an even greater threat to life than the madman Bush and the PNAC http://www.newamericancentury.org/ ambitions driving USA today. It is too late to reverse the global warming our activities have created. To avoid the same fate as the dinosaurs it is imperative we create an alternative haven for humanity, and perhaps life itself. It is time humanity evolved further. "A small step for a man, a giant leap for mankind" was just the beginning.