Well, New York City probably will be largely underwater in 150 years anyways, but not because of the BFRs. SpaceX plans to synthesize the fuel by using water, s

Well, New York City probably will be largely underwater in 150 years anyways, but not because of the BFRs. SpaceX plans to synthesize the fuel by using water, solar power and captured carbon dioxide from the earths athmosphere - just like it will be done on mars.