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This Concept Map, created with IHMC CmapTools, has information related to: Leung, Space is crowded with debris. therefore (ArgScheme: modus ponens) We should regulate space., Earth's orbit is very valuable. therefore (ArgScheme: modus ponens) We should regulate space., Space is crowded with debris. therefore (ArgScheme: modus ponens) Space debris is harmful., Earth's orbit is very valuable. therefore (ArgScheme: modus ponens) Space debris crowds Earth's orbit.