1. space debris are a global space environment problem requiring ... 1.1 fast reaction to maintain/re-gain control ("Kessler Syndrome") 1.2 strict implementation of space debris mitigation measures 1.3 removal of 10±5 large objects per year to reach a "zero growth rate" 1.4 international consensus to enable an effective environment control 2. open issues: 2.1 solution concepts are technically demanding and potentially costly; they must, however, be seen in context with a possible degradation or even loss of parts of the existing space infrastructure 2.2 mass removal operations must be backed by a legal framework and by political support at the international level 3. categorical imperative of space operations (J.P. Loftus/NASA, 1990s): 3.1 space operations should comply with a general rule of the National Park Service; what you take in you must take out".
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