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ESA's Don Quijote is an asteroid deflection precursor mission concept, assessed by the General Studies Programme in the Future and Strategic Studies Office. It is designed to demonstrate and validate the technology that one day could be used to deflect an asteroid threatening the Earth.
http://spaceguard.iasf-roma.inaf.it/
The Spaceguard Foundation, an international private association officially set-up in 1996, aimed at the study of NEOs (asteroids and comets coming near the Earth), and at the protection of the Earth environment against the risk of impact.