A Million Reasons to Go To Space - Brief thoughts from dozens of (mostly) NY space activists on why we need to be in space.

Bioterrorism May Spur Space Colonies - Plans to save civilization by sending people and important documents into space in a 21st Century Noah's Ark might get a boost from fears of bioterrorism.
Meta Description: [ Plans to save civilization by sending people and important documents into space in a 21st Century Noah's Ark might get a boost from fears of bioterrorism. ]

Colonies in space may be only hope, says Hawking - Interview with Britain's Daily Telegraph in which eminent cosmologist Stephen Hawking warns that the human race is likely to be wiped out before the millennium is out unless we set up colonies in space.
Meta Description: [ Daily news from the UK, business news, countryside news, UK technology news, obituaries and UK education news - telegraph.co.uk, UK online newspaper. ]

Foreign Affairs: A Hopeful Future for Mankind - Louis J. Halle, formerly of the U.S. Department of State, writes in Foreign Affairs (Summer 1980) that space colonization will protect humanity in the event of a global nuclear war (subscription/payment required for full article).
Meta Description: [ The first question to which I here address myself is that of what chance humankind has of forever escaping such nuclear warfare as might largely foreclose any possibility of a hopeful future. The second is that of what provision our kind might make for the retention of a hopeful future in any case. ]

Letters from the National Space Society - A collection of letters in support of space exploration, sent to and published in newspapers and other media around the world.

National Space Society: Statement of Philosophy - Vision of people living and working in thriving communities beyond the Earth

NSS Policy Committee: Position Statements and Alerts - Collection of statements on space policy, including essays on colonization and use of space resources.
Meta Description: [ The Purpose of the NSS is to further the goalof the exploration and settlement of space. ]

Our Future in the Cosmos - Essay by Isaac Asimov about the need for the future settlement of space.

Sagan's rationale for human spaceflight - The Space Review - Essay describes space scientist Carl Sagan's thoughts on why human flights to space should continue.

Solar Power Satellites - A brief essay on Solar Power Satellites, a key element of O'Neil's High Frontier program

Somewhere Else Entirely - A reminder for the 21st century, on why O'Neill's vision of orbital habitats still trumps planetary chauvinism, at least in the medium term.

Space and Human Survival (Sylvia Engdahl) - An essay by science fiction author Sylvia Engdahl on why colonizing space is essential to human survival.
Meta Description: [ An essay by science fiction author Sylvia Engdahl on why colonizing space is essential to human survival. ]

Space and survival - Wikipedia, the free encyclopedia - Encyclopedia article on the relationship between the colonization of space and the long-term survival of the human species.

Space Colonization and SETI - Interview with Gerard K. O'Neill by John Kraus of COSMIC SEARCH.

Space Quotes to Ponder - Over 100 brief quotations explaining why expansion of civilization into space is essential to the future survival and evolution of humankind.
Meta Description: [ Quotations from well-known people about why humankind must expand into space ]

Spaceflight or Extinction - Manifest page with links to scientists advocating space colonization.

Syliva Engdahl on space - Essays, quotes, and a radio interview from science fiction author Sylvia Engdahl, about the importance of expanding beyond Earth.
Meta Description: [ Home page for Space subsite of science fiction author Sylvia Engdahl. ]

The Big Picture - Essay by astronaut John Young about the need to preserve our species by putting humans permanently on the moon and Mars.
Meta Description: [ The BIG Picture - an essay by John Young for the continuation of space exploration. ]

The Case for Space Colonization Now - Detailed argument for space colonization by Oscar Falconi.
Meta Description: [ The case for space colonization now ]

The Greater Earth Manifesto - A strong statement on the human space imperative by a group of European organizations.

The Political Economy of Very Large Space Projects by John Hickman, Ph.D. - Explanation of why large space projects (such as solar power satellites, O'Neill colonies, etc) will necessarily be government funded public works, at least at first, rather than created through pure private enterprise.

The Preparation: Space Colonization - Detailed discussion by Rex Stephens about his book on the need for space colonization, asteroid mining, and transhumans.
Meta Description: [ Nanotechnology is coming. With it will come transhumans. Life as we know it will cease to exist. The aging process stoped. Where will we live? Space colonization is imperative for life to continue. ]

The Space Review: The Space Flag - Article by Michael Huang suggesting a new space flag as a rallying point for human colonization of space.

The Top 3 Reasons to Colonize Space - SPACE.com asks Freeman Dyson and two other space-colonization enthusiasts why we should go beyond our home planet.
Meta Description: [ SPACE.com asks Freeman Dyson and two other space-colonization enthusiasts why we should leave the planet. The answers are as varied and as colorful as the places we might go. ]

The top Three Reasons for Humans in Space - Short manifest for space colonisation.

Top Ten Reasons to Inhabit Outer Space - Report from the news service space.com about experts' opinions on why we should colonize space.
Meta Description: [ The possibility of water on Mars and the moon has fueled speculation as to when and if humans will colonize space. With the growing commercializationof space, and the possibility of people spending longer periods of time off theEarth, questions arise as to why we should seek to inhabit space. ]

Why We Do -- and Must -- Go Into Space - Essay by Jeffrey Liss of the National Space Society, on the many reasons behind our drive to do things in space.