The Guardian reports that Virgin Galactic’s Will Whitehorn was “hopping mad” over a recent study indicating that SpaceShipTwo might not be as clean as the company claims:
“The research was fundamentally wrong,” he says. “If you had a Virgin Galactic program running for ten years, if you assumed that we weren’t using biobutinol (which we will) we’re talking about less environmental impact over ten years than 1.5 shuttle launches.”