# Once there is a self-sustaining level of life in space, life's long-range future will be… by Martin Rees > "Once there is a self-sustaining level of life in space, life's long-range future will be secure from risks on Earth." > **— Martin Rees**, *Space-survival writings, compressed candidate wording* Verification Status: Unverified — exact wording/source has not yet been independently confirmed against a primary source; source clue: Space-survival writings, compressed candidate wording.