I think that we should develop commercial space travel only if the benefits could outweigh the negatives. Just as regular travel (planes, trains and automobiles) all have extremely negative effects on the environment and atmosphere, I can assume that space travel has an even more significant impact. That being said, if we could learn things, gather new information or create a new invention that would greatly benefit populations to come then it is something to consider as I do believe that the unexamined life is not worth living.
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