The VSS Unity rocket plane that Branson will travel on is air-launched and burns solid fuel for one minute to fly 50 or so miles above Earth. Virgin Galactic likens the carbon footprint for passengers to a business class return ticket on a transatlantic flight. Using data from the International Civil Aviation Organization that means about 1,238kg of CO2 per passenger.
The journey lengths are not the same, however. A return transatlantic flight covers about 6,900 miles. Virgin Galactic's trip up and down adds up to about 100 miles. Per passenger, per mile, the CO2 emissions are 12kg of CO2 for Virgin's space trip versus 0.2kg of CO2 for the commercial airline flight.
The overall CO2 footprint of space flights appears modest, mostly because rocket flights are still rare. But if space tourism takes off, expect more focus on the environmental impact of this new hobby for the wealthy.
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