Defining rocket fuel cleanliness ultimately depends on prioritizing which of the following environmental metrics?
Answer
Ozone depletion, localized particulate warming, or global $ ext{CO}_2$ forcing
The assessment of cleanliness is complex, requiring prioritization among distinct environmental metrics: ozone depletion (e.g., chlorine, water vapor), localized particulate warming (soot), or global $ ext{CO}_2$ forcing.
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