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Environmental IssuesKeeping things clean and reasonably tidy.The Office of Technology Assessment Orbiting Debris: A Space Environmental Problem-Background Paper A handy Calculator for some atmospheric factors International Conference on Green Propellant for Space Propulsion GreenCELSSTaskFORCE· CELSS Biological Life Support Bioregenerative Mars Moon Earth Waste Treatmentment Resource Recovery Closed Systems ESA Portal - Expanding Frontiers - Green Propellant for Space Occupational Safety & Health Administration U.S. Environmental Protection Agency Advances in Space Environment Research |