Space to live : The search for an alternative home for humanity / Roderick J. Hill.

Life on Earth, how unusual is it, why its future is under threat, and what might be done to ensure its survival
Are we alone? The search for extraterrestrial life
Scenarios for the demise of humanity
How urgent is the imperative to search for other locations for humans to live?
Potential locations for human settlement
The record of space travel so far
Options for establishing a permanent settlement in Earth's immediate environment
Options for settlement beyond the Earth-moon setting but within the solar system
Options for settlement outside our solar system
The journey off Earth
The tyranny of distance and time
Physical, social, and psychological challenges of space travel
Current spacecraft options for human transportation
Options for spacecraft propulsion technology
What next?
A summary of the challenges for a human settlement off Earth
Humans or machines?
Summary and conclusions.