I would argue that the "new contributions to greenhouse emissions" are not substantial, but rather insignificant enough to simply not discuss them. A current Sp

I would argue that the "new contributions to greenhouse emissions" are not substantial, but rather insignificant enough to simply not discuss them. A current SpaceX launch has the fuel consumption and GEG emissions equivalent to a single airliner flying across the Atlantic - but space launches are rare events, but such airliners fly hundreds of times each day. A 1% change in overseas vacation habits has a much larger impact than this hypothetical space program.