Yes, relatively speaking, each launch contributes a "large" amount, but it is completely irrelevant when looking at the overall picture. There are ~100 launches a year, compared with 7 billion miles driven by automobiles per year [1] for example.

I don't have a source handy, but I remember hearing that each launch is the equivalent of the annual output of 2 passenger vehicles. So all rockets launches worldwide = 200 drivers.

[1] https://www.businesswire.com/news/home/20171113006466/en/Fut...

Yes, some do. Blue Origin's BE-4 engine will run on methane, SpaceX' Raptor engine does as well, Falcon 9s are using refined kerosine instead (i.e. 'gas'). The total amount emitted is negligible compared to aviation or shipping though.

Depends on the fuel. With hydrogen powered rockets a la shuttle main engines, yes. Most of the recent pushes have been kerosene or methane fueled, though.

But in the scheme of things, it's really not worth complaining about them vs. our enormous vehicle fleets.

Depending on their fuel, they dump some carbon. I would expect that all the rockets launched since Goddard do not add up to significant amounts of carbon.

rpjguy seems to regard the rocket thing as Bezos's hobby, for his own entertainment, rather than as an actual attempt to get humanity into space in a meaningful way.

A rocket burning all its fuel dumps a lot more carbon than a plane, however, since there are so many more plane flights than rocket flights, the total amount is insignificant in comparison.

Use reclaimed methane from a landfill and you’re even having a net benefit!

Rockets do emit CO2 but it is a very insignificant amount.