The rise of space tourism could affect Earth's climate in unforeseen ways, scientists worry

Ok, one Virgin flight is equivalent to a ten-hour commercial flight, and they envision several flights per day. There are probably 4000 or more commercial flights in the air at any one moment. That would be a lot of equivalent ten-hour flights. I hardly think the Virgin and similar flights would add much considering air flights, ocean going ships, and road vehicles.
Secondly, the Blue Origins flight was powered with hydrogen and oxygen, no carbon at all. Worst it can do is make it rain. Perhaps the Virgin flights can do the same with some redesign.
 

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